Disorders of respiration system Questions in English

(A) When a bronchus is completely obstructed,air can no longer enter or leave the portion of the lung (lobe or segment) supplied by that bronchus.
Over time,the air trapped in the alveoli of that region is absorbed into the blood.
As the air is absorbed and no new air replaces it,the alveoli deflate and the affected portion of the lung collapses,a condition known as atelectasis.

(C) When the thoracic wall is punctured,the intrapleural pressure,which is normally negative (sub-atmospheric),becomes equal to the atmospheric pressure. This condition is known as pneumothorax. Because the lungs are elastic and rely on the negative pressure of the pleural cavity to remain expanded against the chest wall,the loss of this negative pressure causes the lungs to collapse. As a result,the surface area for gas exchange is drastically reduced,leading to severe respiratory distress and an increase in the breathing rate as the body attempts to compensate for the lack of oxygen.

(B) Pleurisy is the inflammation of the pleura,which is the double-layered membrane surrounding the lungs.
It often causes sharp chest pain that worsens during breathing.
It may produce a rasping sound due to the rubbing of the roughened pleural surfaces against each other.
Additionally,an accumulation of fluid in the pleural cavity,known as pleural effusion,may also develop as a result of pleurisy.

(D) Atelectasis is the partial or complete collapse of the lung or a lobe of the lung. It occurs when the tiny air sacs (alveoli) within the lung become deflated or filled with alveolar fluid.
$(a)$ Blockage of small bronchi with mucous prevents air from reaching the alveoli,leading to their collapse.
$(b)$ Obstruction of a major bronchus prevents air from entering a significant portion of the lung,causing that area to collapse.
$(c)$ Surfactant is essential to reduce surface tension in the alveoli; its absence causes the alveoli to collapse due to high surface tension.
Therefore,all the mentioned factors can lead to atelectasis.

(C) The partial pressure of carbon dioxide $(pCO_2)$ in the blood is strictly regulated by the respiratory center in the medulla oblongata.
High levels of $pCO_2$ (hypercapnia) lead to respiratory acidosis,which decreases the blood $pH$.
When $pCO_2$ levels exceed $500\,mm\;Hg$,the resulting severe acidosis and toxic effects on the central nervous system can lead to unconsciousness,coma,and eventually death.

(A) Asphyxia is a condition of severely deficient supply of oxygen to the body that arises from being unable to breathe normally.
In this state,the respiratory centre in the medulla oblongata becomes inhibited due to the accumulation of $CO_2$ and lack of $O_2$,leading to a cessation of breathing.
Therefore,the correct term for the inhibition of the respiratory centre is Asphyxia.

(D) $Cyanosis$ is the bluish discoloration of the skin and mucous membranes.
It occurs due to the presence of a high concentration of deoxygenated haemoglobin in the cutaneous blood vessels.
This condition is often a clinical sign of hypoxemia or poor circulation.

(C) $Anoxia$ is a pathological condition characterized by a severe deficiency or complete lack of oxygen in the body tissues.
It occurs when the oxygen supply to the tissues is insufficient to meet their metabolic demands,which can be caused by various factors such as low atmospheric oxygen,respiratory failure,or circulatory issues.
Therefore,the correct description is a lack of oxygen in the tissues.

(C) $Asthma$,$Bronchitis$,and $Pneumonia$ are disorders related to the respiratory system and affect the lungs.
$Encephalitis$ is an inflammation of the brain tissue,typically caused by a viral infection,and is not a lung disease.

(D) . In asthma,an allergic reaction occurs in the bronchioles of the lungs. During this reaction,mast cells release chemical mediators like histamine,which cause inflammation and spasm in the bronchial muscles,leading to difficulty in breathing.

(B) Decompression sickness,also known as $Caisson$ disease or the bends,occurs in deep-sea divers.
When a diver goes to a great depth,the high pressure causes nitrogen to dissolve in the blood and tissues.
If the diver ascends to the surface too rapidly,the sudden decrease in pressure causes the dissolved nitrogen to form bubbles in the blood and tissues.
These nitrogen bubbles block blood vessels and cause severe pain and tissue damage,which is known as decompression sickness.

(C) $Emphysema$ is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. It is often caused by cigarette smoking or long-term exposure to air pollutants. The destruction of alveolar walls leads to the formation of large air chambers,which reduces the surface area available for gas exchange.

(C) At high altitudes,the atmospheric pressure is low,which results in a lower partial pressure of oxygen $(pO_2)$.
Due to this,the body does not get sufficient oxygen for cellular respiration.
To compensate for this low oxygen availability,the human body increases the production of red blood cells $(RBCs)$ to enhance the oxygen-carrying capacity of the blood.
This is a physiological adaptation to survive in hypoxic conditions.

(C) Oxygen toxicity occurs when pure oxygen is inhaled for a prolonged period at high partial pressures.
This condition leads to the production of reactive oxygen species $(ROS)$ that damage cellular components.
Clinically,it is associated with the progressive failure of ventilation of the lungs,as the high concentration of oxygen interferes with the normal respiratory drive and causes damage to the pulmonary tissues.

(D) The condition where there is an inadequate supply of $O_2$ to the tissues or cells is known as $Hypoxia$.
$Anoxia$ refers to the complete absence of $O_2$.
$Asphyxia$ is a condition of severe deficient supply of $O_2$ to the body that arises from being unable to breathe normally.
$Pleurisy$ is the inflammation of the pleura,the membrane surrounding the lungs.
Therefore,the correct term for inadequate $O_2$ levels is $Hypoxia$.

(C) At high altitudes (like $15000$ feet),the atmospheric pressure is low,which results in low oxygen availability. This condition is known as altitude sickness.
Symptoms of altitude sickness include nausea,fatigue,heart palpitations,and dizziness.
As the body struggles to get enough oxygen,it may also lead to a bluish tinge on the skin,nails,and lips (cyanosis) due to hypoxia.
Therefore,the symptoms listed in option $C$ are characteristic of altitude sickness.

(A) Mountain sickness occurs because as altitude increases,the atmospheric pressure decreases,which leads to a lower partial pressure of oxygen $(pO_2)$.
Due to the lower $pO_2$ at high altitudes,the body does not get enough oxygen,resulting in hypoxia (low oxygen in the blood).
Symptoms include nausea,fatigue,and heart palpitations.
Therefore,the primary cause is the decrease in oxygen availability at high altitudes.

(A) At high altitudes like Mount Everest,the atmospheric pressure is low,which results in low oxygen availability (hypoxia).
To compensate for this low oxygen level,the human body increases the production of red blood cells (RBCs) to enhance the oxygen-carrying capacity of the blood.
This is a physiological adaptation to high-altitude stress.

(A) Adenoids are masses of lymphoid tissue located at the back of the nasal cavity,in the roof of the nasopharynx.
When these tissues become inflamed or enlarged,it is referred to as adenoid hypertrophy or simply 'adenoids'.
This condition can obstruct the airway,leading to breathing difficulties,especially in children.

(D) Asthma is a chronic respiratory condition characterized by inflammation and narrowing of the airways.
It is primarily caused by a spasm or contraction of the smooth muscles surrounding the bronchi and bronchioles (bronchial muscles).
This constriction,often triggered by allergens or irritants,makes it difficult for air to flow in and out of the lungs,leading to symptoms like wheezing,shortness of breath,and coughing.

(A) Black lung disease,also known as coal worker's pneumoconiosis,is a respiratory condition caused by the long-term inhalation of coal dust.
It is common among coal miners because they are frequently exposed to coal dust in their working environment.
The dust particles accumulate in the lungs,leading to inflammation,fibrosis,and necrosis of the lung tissue.

(A) Cyanosis is a medical condition characterized by a bluish or purplish discolouration of the skin and mucous membranes.
It occurs due to an abnormally low concentration of oxygen in the blood (hypoxemia) or poor circulation.
When blood is deoxygenated,it appears darker,which manifests as a blue tint on the skin,particularly in areas like the lips,fingers,and toes.

(C) The correct matches are as follows:
$(A)$ Jaundice: It is characterized by the yellowing of skin and eyes due to an increase in bile pigments (bilirubin) in the blood. Thus,$A-s$.
$(B)$ Stenosis: It refers to the narrowing or constriction of a passage or orifice,such as a heart valve defect. Thus,$B-r$.
$(C)$ Rhinitis: It is the inflammation of the mucous membrane inside the nose,often caused by allergies. Thus,$C-p$.
$(D)$ Paralysis: It is the loss of muscle function in part of the body. Thus,$D-q$.
Therefore,the correct combination is $A-s, B-r, C-p, D-q$.

(A) Tobacco smoke contains carbon monoxide $(CO)$.
$CO$ has a much higher affinity (about $200-250$ times) for haemoglobin compared to oxygen $(O_2)$.
When inhaled,$CO$ binds with haemoglobin to form carboxyhaemoglobin,which is a stable compound.
This prevents oxygen from binding to haemoglobin,thereby significantly reducing the oxygen-carrying capacity of the blood.

(C) The correct answer is $C$. Emphysema is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. Cigarette smoking is a major cause of this condition.

(C) Fluoride is a toxic pollutant that enters plants primarily through the stomata of the leaves.
Once inside,it accumulates in the leaf margins and tips because these areas are the final destination of the transpiration stream.
This accumulation leads to the death of leaf tissue,a condition commonly known as $Tip \ burn$ or marginal necrosis.

(D) $CO$ is highly toxic and impairs respiration. $CO$ combines with the haemoglobin of the blood to form carboxyhaemoglobin,which is much more stable than oxyhaemoglobin. This reduces the oxygen-carrying capacity of the blood,leading to tissue hypoxia.

(A) Emphysema is a chronic respiratory disorder in which alveolar walls are damaged due to which respiratory surface is decreased. The most common cause of emphysema is cigarette smoking,which leads to the destruction of the alveolar walls.

(C) Emphysema is a chronic disorder in which the alveolar walls are damaged due to which respiratory surface is decreased. Cigarette smoking is a major cause of this condition.

(A) Emphysema is a chronic disorder in which the alveolar walls are damaged due to which respiratory surface is decreased. Cigarette smoking is a major cause of this disease.

(D) Emphysema is a chronic respiratory disorder in which the alveolar walls are damaged due to which respiratory surface is decreased.
It is mainly caused by cigarette smoking.
As the alveolar walls break down,the total surface area available for gas exchange is significantly reduced,leading to difficulty in breathing.

(D) Hypoxia is a pathological condition where the body or a region of the body is deprived of adequate oxygen supply at the tissue level.
$1$. Low oxygen in the atmosphere (hypoxic hypoxia) reduces the partial pressure of oxygen,leading to decreased oxygen diffusion into the blood.
$2$. High $CO_2$ in the air can interfere with oxygen binding or cause respiratory distress,contributing to hypoxic conditions.
$3$. Low $RBC$ count (anemic hypoxia) reduces the oxygen-carrying capacity of the blood,resulting in insufficient oxygen delivery to tissues.
Therefore,all the listed factors can lead to hypoxia.

(C) Emphysema is a chronic respiratory disorder in which the alveolar walls are damaged due to which respiratory surface is decreased.
Cigarette smoking is the primary cause of emphysema,as the toxic chemicals in smoke lead to the destruction of alveolar walls over time.
Therefore,the correct option is $C$.

(D) Smoking addiction is harmful to the body in multiple ways:
$1$. $Emphysema$: Smoking damages the alveolar walls, leading to a decrease in the respiratory surface area.
$2$. $Bronchitis$: Chronic inflammation of the bronchi occurs due to constant irritation from smoke.
$3$. $Heart \text{ } attack$: Smoking increases blood pressure and heart rate, and promotes the buildup of plaque in arteries, significantly increasing the risk of cardiovascular diseases.
Therefore, all the mentioned conditions are associated with smoking addiction.

(D) Asthma is a chronic respiratory disorder characterized by wheezing and difficulty in breathing.
It is caused due to the inflammation of the bronchi and bronchioles.
This inflammation leads to the narrowing of the airways,making it difficult for air to pass through,which results in the characteristic symptoms of asthma.

(A) Cyanosis is a condition characterized by a bluish discoloration of the skin,nail beds,or mucous membranes. This occurs due to an abnormally high concentration of deoxygenated hemoglobin in the blood. Therefore,the correct color associated with cyanosis is blue.

(A) $CO$ (Carbon monoxide) is a toxic gas that binds to hemoglobin in the blood to form a stable compound called carboxyhemoglobin. This compound is much more stable than oxyhemoglobin,which prevents hemoglobin from transporting oxygen to the body's tissues,leading to hypoxia and potentially death.

(B) Carbon monoxide $(CO)$ is a toxic gas that binds to hemoglobin with an affinity approximately $200-250$ times greater than that of oxygen.
Even at very low concentrations,$CO$ can significantly reduce the oxygen-carrying capacity of blood by forming carboxyhemoglobin.
In the alveoli,a concentration of $CO$ as low as $0.04\%$ and a partial pressure ranging from $0-7 \, mm \, Hg$ is considered dangerous to human health as it leads to hypoxia.

(A) Carboxyhemoglobin is formed when hemoglobin binds with carbon monoxide $(CO)$ instead of oxygen $(O_2)$.
Carbon monoxide has an affinity for hemoglobin that is approximately $200$ to $250$ times greater than that of oxygen.
When $CO$ is inhaled,it binds to hemoglobin to form carboxyhemoglobin,which reduces the oxygen-carrying capacity of the blood,leading to hypoxia.
Therefore,an abnormally high level of carboxyhemoglobin in the blood indicates exposure to high levels of carbon monoxide.

(B) Occupational hazards are health conditions caused by the environment in which a person works.
$Pneumoconiosis$ is a general term for a class of interstitial lung diseases caused by the inhalation of certain dusts,such as coal dust,silica,or asbestos,which are common in mining and industrial settings.
While $Silicosis$ is a specific type of $Pneumoconiosis$,$Pneumoconiosis$ is the broader medical term used to categorize these occupational respiratory diseases.
Therefore,$Pneumoconiosis$ is the most appropriate answer representing a category of occupational lung diseases.

(C) Pneumonia is caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
In severe cases of pneumonia, the alveoli get filled with fluid leading to severe problems in respiration.
Due to the lack of oxygen in the blood, the lips and fingernails of patients may turn from gray to bluish in color.

(A) The common cold is a viral infection of the upper respiratory tract.
It causes inflammation of the nasal mucosa,which leads to congestion and blockage of the nasal passages.
This blockage prevents odor molecules from reaching the olfactory receptors in the nasal cavity,resulting in a reduced sense of smell (olfactory sensation).
Therefore,the correct observation is that olfactory sensation is reduced.

(B) Pneumonia is a disease caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
It primarily affects the alveoli (air-filled sacs) of the lungs.
In this disease, the alveoli get filled with fluid, leading to severe problems in respiration.
Malaria is caused by $Plasmodium$ (a protozoan), Typhoid is caused by $Salmonella \text{ } typhi$ (affecting the intestine), and Ringworm is a fungal infection of the skin.

(A) Pneumonia is caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$, which infect the alveoli of the lungs.
As a result of the infection, the alveoli get filled with fluid leading to severe problems in respiration.
Therefore, Assertion $A$ is true because it is a serious respiratory disease, and Reason $R$ is true because the fluid accumulation in the alveoli directly causes the respiratory distress associated with the disease, making $R$ the correct explanation of $A$.

(C) In $Pneumonia$,the alveoli of the lungs get filled with fluid,which severely reduces the respiratory surface area for gas exchange.
This leads to a decrease in oxygen levels in the blood (hypoxia).
As a result,the fingernails and lips of patients may turn from a normal color to a greyish or bluish color due to the lack of oxygenated hemoglobin.

(A) Pneumonia is caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
In this disease, the alveoli of the lungs get filled with fluid, leading to severe problems in respiration.
The symptoms of pneumonia include fever, chills, cough, and headache.
In severe cases, the lips and fingernails may turn gray to bluish in color.
Additionally, the patient often produces blood-stained sputum (phlegm) due to the infection in the lungs.
Therefore, the correct option is $A$.

(C) Smoking tobacco releases carbon monoxide $(CO)$ into the blood.
Carbon monoxide has a much higher affinity for hemoglobin $(Hb)$ than oxygen $(O_2)$.
It binds with hemoglobin to form carboxyhemoglobin,which is a stable compound.
This reduces the oxygen-carrying capacity of the blood,leading to a decrease in the amount of $O_2$ bound to $Hb$ and an increase in $CO$ levels in the blood.

(D) Cigarette smoke contains carbon monoxide $(CO)$,which is a poisonous gas.
When inhaled,$CO$ binds to hemoglobin in the red blood cells with an affinity approximately $200$ to $250$ times greater than that of oxygen.
This forms carboxyhemoglobin,which reduces the oxygen-carrying capacity of the blood,leading to hypoxia and various cardiovascular issues.
Therefore,excessive smoking significantly increases the concentration of $CO$ in the blood.

(C) Smoking tobacco releases carbon monoxide $(CO)$ into the blood.
$CO$ has a much higher affinity for hemoglobin $(Hb)$ than oxygen $(O_2)$.
It binds with hemoglobin to form carboxyhemoglobin $(HbCO)$,which is a stable compound.
This reduces the oxygen-carrying capacity of the blood,leading to a decrease in the amount of $O_2$ bound to $Hb$.

(A) Pneumonia is a respiratory infection caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
In this disease, the alveoli (air sacs) of the lungs get filled with fluid, which leads to severe problems in respiration.
Symptoms include fever, chills, cough, and headache. In severe cases, the lips and fingernails may turn gray to bluish in color.