Disorders of Muscular and Skeletal System Questions in English

(A) hernia occurs when an internal organ or fatty tissue squeezes through a weak spot in the surrounding muscle or connective tissue (fascia).
In the most common type,an inguinal hernia,a portion of the intestine protrudes through a weak area in the abdominal wall into the inguinal canal.
Therefore,the most accurate description among the given options is the descent or protrusion of the intestine into the inguinal canal.

(A) The accumulation of uric acid crystals in the joints leads to a condition known as $Gout$.
This occurs due to the excessive formation of uric acid or the inability of the kidneys to excrete it effectively,leading to hyperuricemia and subsequent inflammation of the joints.

(B) As individuals age,the organic matrix of the bone decreases while the mineral content remains relatively high or undergoes changes that reduce flexibility.
This process makes the bones lose their elasticity and become increasingly brittle.
Due to this loss of flexibility,the bones are unable to absorb mechanical stress effectively,making them more prone to fractures upon impact.

(C) sprain is an injury to a ligament,which is the fibrous tissue that connects two bones together. It occurs when a ligament is stretched or torn due to sudden or excessive force,often resulting from a fall or a sudden twist of a joint.

(C) $Sprain$ is an injury to a ligament,which is the fibrous tissue that connects bones to other bones. It occurs when a ligament is overstretched or torn due to sudden movement or trauma. In contrast,a $Fracture$ refers to a broken bone,$Dislocation$ refers to the displacement of bones at a joint,and $Tension$ is a general term for physical stress.

(A) Myasthenia gravis is an autoimmune disorder where the immune system produces antibodies that attack the acetylcholine receptors at the neuromuscular junction.
This prevents the transmission of nerve impulses to the muscles,leading to muscle weakness and fatigue.
Since the body's own immune system mistakenly identifies its own receptors as foreign,the condition is caused by auto-antigens.

(A) 'Paraplegia' is a medical condition characterized by the impairment or loss of motor and sensory function in the lower extremities of the body.
This condition typically results from damage to the spinal cord,specifically affecting the legs and the lower part of the trunk.
Therefore,it refers to the paralysis of both legs.

(B) Arthritis is a medical condition characterized by the inflammation of one or more joints.
It causes pain,swelling,and stiffness in the affected joints,which can limit mobility and range of motion.
Therefore,the correct option is $B$.

(D) Gout is a form of inflammatory arthritis characterized by severe pain,redness,and tenderness in joints.
It is caused by the accumulation of uric acid crystals (monosodium urate) in the synovial fluid and tissues of the joints.
This accumulation occurs due to hyperuricemia,which is an elevated level of uric acid in the blood,often resulting from the body's inability to properly excrete uric acid or the overproduction of it.
Therefore,the correct option is $D$.

(A) sprain is an injury to a ligament,which is the fibrous connective tissue that connects two bones together in a joint.
It occurs when a ligament is stretched beyond its normal capacity or torn due to sudden,excessive pulling or twisting of the joint.
In contrast,a strain refers to an injury to a muscle or a tendon.

(A) Vitamin $D$ deficiency leads to a condition known as rickets in children.
In rickets,the bones become soft and weak due to inadequate mineralization,which often results in skeletal deformities such as bow-leggedness (the legs curve outward at the knees).
Vitamin $D$ is essential for the absorption of calcium and phosphorus,which are necessary for healthy bone development.

(C) The correct matches are as follows:
$a$. Tetany: Rapid spasms in muscle due to low calcium in body fluid $(iv)$.
$b$. Osteoporosis: Age-related disorder characterized by decreased bone mass and increased chances of fractures $(v)$.
$c$. Muscular dystrophy: Progressive degeneration of skeletal muscle mostly due to genetic disorder $(ii)$.
$d$. Arthritis: Inflammation of joints $(iii)$.
$e$. Myasthenia gravis: Autoimmune disorder affecting neuromuscular junction leading to fatigue,weakening,and paralysis of skeletal muscle $(i)$.
Thus,the correct sequence is $a-iv, b-v, c-ii, d-iii, e-i$.

(B) The condition described is known as an Inguinal Hernia.
In this condition,the inguinal canal,which is a passage in the abdominal wall,becomes weak or loose.
Due to this weakness,a loop or portion of the intestine can protrude through the canal and descend into the scrotum,causing pain and swelling.
Therefore,the correct option is $B$.

(B) Rheumatoid arthritis is a chronic autoimmune disorder where the body's immune system mistakenly attacks its own healthy tissues,specifically the synovium (the lining of the membranes that surround the joints). This leads to inflammation,pain,and potential joint destruction. Osteoarthritis is a degenerative joint disease caused by wear and tear,and Gouty arthritis is caused by the accumulation of uric acid crystals; neither are primarily classified as autoimmune diseases.

(C) Osteoporosis is a condition characterized by a reduction in bone mineral density,which makes bones brittle and prone to fractures.
Generalised osteoporosis is common in the elderly and in women after menopause.
After menopause,the levels of the hormone estrogen in the blood plasma are significantly reduced.
Estrogen plays a crucial role in regulating bone cells,specifically osteoblasts (which build bone) and inhibiting excessive activity of osteoclasts (which break down bone).
When estrogen levels drop,the balance of bone remodeling is disrupted,leading to bone loss and osteoporosis.

(D) : Thoracic vertebrae are $12$ in number. Joints between adjacent vertebrae are cartilaginous joints,and the opposing surfaces are connected by fibrocartilage,which allows very little movement. Osteoporosis is a disease characterized by low bone mass and loss of bone tissue that may lead to weak and fragile bones. Osteoporosis occurs when there is an imbalance between new bone formation and old bone resorption. Generalized osteoporosis is common in elderly people and in women following menopause. In osteoporosis,the osteoblastic (bone-forming) activity in the bone is usually less than normal,and consequently,the rate of bone deposition is depressed. Estrogens inhibit osteoclastic (bone-resorption) activity in the bones and therefore stimulate bone growth. After menopause,almost no estrogens are secreted by ovaries. This estrogen deficiency leads to increased osteoclastic activity in the bones,decreased bone matrix,and decreased deposition of bone calcium and phosphate. In some women,this effect results in osteoporosis.

(A) : Myasthenia gravis is an autoimmune disorder in which autoantibodies bind to cholinergic receptors on muscle cells and impair the ability of the neurotransmitter acetylcholine to induce muscular contraction. This leads to fatigue,weakening,and paralysis of skeletal muscles of the mouth and throat,which may prevent normal swallowing.
$B$: Gouty arthritis is caused by the accumulation of uric acid crystals in the joints,not urea or creatine,causing inflammation.
$C$: Osteoporosis is typically caused by a deficiency of vitamin $D$,not an overdose.
$D$: Muscular dystrophy is a genetic disorder characterized by the progressive degeneration of skeletal muscles,not by rapid contractions.

(B) is the correct statement.
$1$. Osteoporosis is an age-related disorder characterized by decreased bone mass and increased chances of fractures.
$2$. Muscular dystrophy is a genetic disorder resulting in progressive degeneration of skeletal muscles.
$3$. Myasthenia gravis is an autoimmune disorder affecting the neuromuscular junction,leading to fatigue,weakening,and paralysis of skeletal muscles,caused by antibodies blocking acetylcholine receptors.
$4$. Gout is the inflammation of joints due to the accumulation of uric acid crystals,not calcium.

(D) $1$. Glomerulonephritis refers to the inflammation of the glomeruli of the kidney.
$2$. Renal calculi are stone or insoluble mass of crystallized salts (like oxalates) formed within the kidney.
$3$. Arthritis is a condition characterized by the inflammation of joints.
$4$. Since all the given pairs correctly describe the respective medical conditions,the correct option is $D$.

(B) Myasthenia gravis is an autoimmune disorder that affects the neuromuscular junction,leading to fatigue,weakening,and paralysis of skeletal muscles.
Asthma is a respiratory disorder.
Nephritis is an inflammation of the kidneys.
Uremia is a condition involving high levels of urea in the blood due to kidney dysfunction.

(C) Osteoporosis is an age-related disorder characterized by decreased bone mass and increased chances of fractures.
It is commonly caused by decreased levels of oestrogen,especially in post-menopausal women,as oestrogen plays a crucial role in maintaining bone density by inhibiting bone resorption.
Option $A$ refers to Myasthenia gravis.
Option $B$ is not a direct cause of osteoporosis.
Option $D$ refers to Gout,which is caused by the accumulation of uric acid crystals in joints.

(B) Myasthenia gravis is an autoimmune disorder that affects the neuromuscular junction,leading to fatigue,weakening,and paralysis of skeletal muscles.
Statement $(I)$ is incorrect because myasthenia gravis is an autoimmune disorder.
Statement $(II)$ is correct as it affects the neuromuscular junction.
Statement $(III)$ is incorrect because low $Ca^{++}$ levels in body fluid cause tetany,not myasthenia gravis.
Statement $(IV)$ is correct as skeletal muscle paralysis is a symptom of this condition.
Therefore,the incorrect statements are $(I)$ and $(III)$.

(D) Statement $A$ is incorrect because Myasthenia gravis is an autoimmune disorder,not a protozoan-caused disease.
Statement $B$ is correct because it is an autoimmune disorder affecting the neuromuscular junction,which leads to fatigue,weakening,and paralysis of skeletal muscles.
Therefore,the correct option is $D$.

(B) Tetany is a condition characterized by intermittent muscle spasms or contractions. It is primarily caused by a low level of calcium ions $(Ca^{2+})$ in the body fluids. This low calcium level increases the excitability of nerves and muscles,leading to involuntary muscle contractions. Therefore,option $B$ is the correct statement.

(C) Osteoporosis is an age-related disorder characterized by decreased bone mass and increased chances of fractures.
Decreased levels of estrogen are a common cause of osteoporosis,especially in post-menopausal women,as estrogen plays a vital role in maintaining bone density.
Option $A$ refers to Myasthenia gravis.
Option $B$ refers to Gout.
Option $D$ refers to Muscular dystrophy.

(B) $1$. Muscular dystrophy is a genetic disorder,not age-related.
$2$. Osteoporosis is characterized by decreased bone mass and increased chances of fractures,commonly associated with decreased estrogen levels in aging.
$3$. Myasthenia gravis is an autoimmune disorder affecting the neuromuscular junction,not specifically the sliding of myosin filaments.
$4$. Gout is caused by the accumulation of uric acid crystals in the joints,not calcium deposition.

(C) $1$. Option $A$ is incorrect because the joints between adjacent vertebrae are cartilaginous joints,not fibrous.
$2$. Option $B$ is incorrect because osteoporosis in old age is primarily caused by decreased levels of estrogen,not progesterone.
$3$. Option $C$ is correct. Gout is a disorder of the skeletal system caused by the accumulation of uric acid crystals in the joints,leading to inflammation and pain.
$4$. Option $D$ is incorrect because the human vertebral column contains $12$ thoracic vertebrae,not $10$.

(A) Osteoporosis is an age-related disorder characterized by decreased bone mass and increased chances of fractures. Decreased levels of estrogen is a common cause,especially in post-menopausal women,as estrogen plays a vital role in maintaining bone density.
$A$ is the correct option because estrogen deficiency leads to increased bone resorption.
$B$ refers to Gout.
$C$ refers to Myasthenia gravis.
$D$ is incorrect as osteoporosis is typically associated with low calcium levels.

(B) Muscular dystrophy is a group of genetic diseases that cause progressive weakness and loss of muscle mass. It is an inherited disorder caused by mutations in genes responsible for muscle structure and function.
Tetany is caused by low calcium levels in body fluids.
Myasthenia gravis is an autoimmune disorder affecting the neuromuscular junction.
Botulism is a rare but serious illness caused by a toxin that attacks the body's nerves.

(A) Arthritis is defined as the inflammation of a joint,which causes pain and stiffness,often leading to restricted movement.
This condition can be caused by various factors,including the reduction of synovial fluid,the ossification of articular cartilage,or the deposition of metabolic waste products like uric acid crystals within the joint cavity.
Since the deposition of such substances (like uric acid) is a known cause of joint inflammation and pain,the Reason correctly explains the Assertion.

(A) The assertion is correct because inflammation of joints (arthritis) leads to stiffness and reduced mobility.
The reason is also correct as it describes specific causes of joint disorders: accumulation of uric acid crystals causes gout,and ossification of articular cartilage (ankylosis) leads to the fusion and immobilization of joints.
Therefore,the reason correctly explains why inflammation and associated pathological changes lead to the immobilization of joints.

(N/A) - $Myasthenia$ $gravis$: It is an autoimmune disorder affecting the neuromuscular junction,leading to fatigue,weakening,and paralysis of skeletal muscle.
- $Muscular$ $dystrophy$: Progressive degeneration of skeletal muscle,mostly due to a genetic disorder.
- $Tetany$: Rapid spasms (wild contractions) in muscle due to low $Ca^{++}$ levels in body fluid.
- $Arthritis$: Inflammation of joints.
- $Osteoporosis$: An age-related disorder characterized by decreased bone mass and increased chances of fractures. Decreased levels of estrogen is a common cause.
- $Gout$: Inflammation of joints due to the accumulation of uric acid crystals.

(B) Myasthenia gravis is an autoimmune disorder that affects the neuromuscular junction.
It specifically leads to the fatigue,weakening,and paralysis of skeletal muscles.
Therefore,the tissue primarily afflicted by this condition is skeletal muscle.

(N/A) The condition characterized by stiff and inflamed joints is known as $Arthritis$.
$Arthritis$ is an inflammation of the joints that causes pain, swelling, and stiffness.
Possible reasons for these symptoms include:
$1$. Aging: Wear and tear of the articular cartilage over time.
$2$. Autoimmune reactions: The immune system attacks the joint tissues (e.g., $Rheumatoid arthritis$).
$3$. Metabolic factors: Accumulation of uric acid crystals (e.g., $Gout$).
$4$. Infection: Bacterial or viral infections affecting the synovial fluid.

(N/A) Gout is a disorder of the skeletal system caused by the accumulation of uric acid crystals in the joints.
It occurs due to abnormalities in the metabolism of purines,leading to high levels of uric acid in the blood (hyperuricemia).
These crystallized salts deposit in the joints,causing inflammation,severe pain,and swelling,a condition known as gouty arthritis.

(B) The condition described is known as an Inguinal Hernia.
In this condition,the inguinal canal,which is a passage in the abdominal wall,becomes weak or loose.
Due to this weakness,a portion of the intestine or fatty tissue protrudes through the canal into the scrotum.
This is a common medical condition that often requires surgical intervention.

(C) The correct answer is option $(C)$.
$(a)$ Gout: It is caused by the accumulation of uric acid crystals in the joints,leading to inflammation. Thus,$(a)$ matches with $(iii)$.
$(b)$ Osteoporosis: It is an age-related disorder characterized by decreased bone mass and increased chances of fractures. $A$ common cause is decreased levels of estrogen in post-menopausal women. Thus,$(b)$ matches with $(i)$.
$(c)$ Tetany: It is characterized by rapid spasms (wild contractions) in muscles due to low $Ca^{2+}$ levels in body fluids. Thus,$(c)$ matches with $(ii)$.
$(d)$ Muscular dystrophy: It is a genetic disorder that results in the progressive degeneration of skeletal muscles. Thus,$(d)$ matches with $(v)$.
Note: Myasthenia gravis is an autoimmune disorder,which corresponds to $(iv)$.

(B) The correct answer is $B$ (Muscular dystrophy).
Muscular dystrophy is a genetic disorder that leads to the progressive degeneration of skeletal muscles,usually due to the absence of specific proteins like dystrophin.

(C) Muscular dystrophy is a group of diseases that cause progressive weakness and loss of muscle mass. It is primarily caused by genetic mutations that interfere with the production of proteins needed to form healthy muscle. Therefore,it is classified as a genetic disorder.

(B) Gout is a disorder of the skeletal system characterized by the inflammation of joints.
It occurs due to the accumulation of uric acid crystals in the synovial joints,which leads to pain,swelling,and stiffness.

(C) rapid spasm is also known as a wild contraction of the muscles. This condition occurs due to a low level of $Ca^{2+}$ ions in the body fluids or the sarcoplasmic reticulum. When the concentration of $Ca^{2+}$ ions falls below the normal physiological level,it disrupts the normal relaxation and contraction cycle,leading to involuntary,sustained,or rapid muscle contractions,commonly referred to as tetany or spasms.

(B) The correct answer is $Arthritis$.
$Arthritis$ is defined as the inflammation of joints.
$Rheumatoid \text{ } arthritis$ involves the deposition of hard tissue over articular cartilage along with increased secretion of synovial fluid, causing pain and stiffness.
$Osteoarthritis$ involves the wearing down of articular cartilage and the development of bony lumps at joints, causing pain, stiffness, and permanent bending.

(C) The correct answer is Osteoporosis.
Osteoporosis is an age-related disorder characterized by decreased bone mass and increased chances of fractures.
$A$ decreased level of oestrogen,particularly after menopause,is a common cause of this disease as it leads to a reduction in bone density.

(C) In Myasthenia gravis,the neuromuscular junction is affected.
It is an autoimmune disorder in which antibodies attack and block the acetylcholine receptors at the post-synaptic membrane,thereby inhibiting the excitatory effects of the neurotransmitter acetylcholine.

(A) The condition described is known as arthritis,which involves inflammation of the joints.
Accumulation of uric acid crystals in the joint cavity (as seen in Gout) and the ossification (hardening) of articular cartilage (as seen in Osteoarthritis) lead to inflammation,pain,and restricted movement of the joints.
Therefore,both the Assertion and the Reason are correct,and the Reason provides a valid explanation for the inflammation and immobilization of the joint.

(C) $Myasthenia \text{ } gravis$ is a chronic autoimmune disorder.
It affects the neuromuscular junction, which is the site where a motor neuron communicates with a muscle fiber.
In this condition, antibodies block or destroy the acetylcholine receptors at the neuromuscular junction.
This prevents the muscle from receiving signals from the nerve, leading to fatigue, weakening, and eventually paralysis of the skeletal muscles.

(B) Osteoporosis is an age-related disorder of the skeletal system characterized by decreased bone mass and increased chances of fractures.
It is commonly caused by decreased levels of estrogen,particularly in women after menopause,rather than increased levels.
Therefore,Assertion $(A)$ is correct,but Reason $(R)$ is incorrect.

(D) $1$. $Tetany$: This condition is caused by low $Ca^{2+}$ levels in body fluid, leading to wild contractions or spasms in muscles.
$2$. $Myasthenia$ $gravis$: This is an autoimmune disorder affecting the neuromuscular junction, leading to fatigue, weakening, and paralysis of skeletal muscle. It is not a genetic disorder.
$3$. $Muscular$ $dystrophy$: This is a genetic disorder resulting in the progressive degeneration of skeletal muscle. It is not an autoimmune disorder.
$4$. $Arthritis$: This condition refers to the inflammation of joints. Therefore, this is the correct match.

(D) Muscular dystrophy is a progressive degeneration of skeletal muscles mostly due to a genetic disorder.
Myasthenia gravis is an autoimmune disorder affecting the neuromuscular junction.
Osteoporosis is an age-related disorder characterized by decreased bone mass and increased chances of fractures.
Tetany is a condition of rapid spasms (wild contractions) in muscle due to low $Ca^{2+}$ ion concentration in the body fluid.