Pancreas Questions in English

(C) The pancreas is a composite gland,which functions as both an exocrine and an endocrine gland.
Its exocrine portion secretes pancreatic enzymes into the duodenum,while the endocrine portion consists of the islets of Langerhans.
There are about $1$ to $2$ million islets of Langerhans in a normal human pancreas,representing only $1$ to $2 \%$ of the pancreatic tissue.

(B) Diabetes mellitus is a condition characterized by high blood glucose levels due to either insufficient production of insulin by the pancreas or the body's inability to effectively use the insulin produced. Insulin is a peptide hormone secreted by the $\beta$-cells of the Islets of Langerhans in the pancreas,which facilitates the uptake of glucose into cells. Therefore,diabetic patients are treated by administering insulin therapy to regulate their blood glucose levels.

(A) The pancreas is a composite gland which acts as both an exocrine and endocrine gland. The endocrine part of the pancreas consists of clusters of cells called Islets of Langerhans. There are about $1$ to $2$ million Islets of Langerhans in a normal human pancreas,which represent only $1-2$ percent of the pancreatic tissue.

(D) Hypersecretion of insulin leads to an excessive decrease in blood glucose levels,a condition known as hypoglycemia.
Common symptoms of hypoglycemia include:
$1$. Sweating
$2$. Irritability
$3$. Tremors or shakiness
$4$. Confusion or double vision
$5$. Palpitations
Glycosuria (presence of glucose in urine) is a symptom of diabetes mellitus,which is caused by the hyposecretion of insulin,not hypersecretion.
Therefore,the correct combination of symptoms for hypersecretion of insulin is $I, II$ and $III$.

(C) The $\delta$ (delta) cells of the pancreas secrete a peptide hormone called somatostatin. Its primary function is to inhibit the secretion of both insulin (from $\beta$ cells) and glucagon (from $\alpha$ cells). It also acts to decrease the secretion,motility,and absorption in the digestive tract.

(B) Insulin,secreted from the $\beta$-cells of the islets of Langerhans (endocrine part of the pancreas),affects the liver,muscle,and adipose tissue.
In muscular tissue,it promotes carbohydrate metabolism and the storage of glycogen.
In liver cells,it favors glycogenesis,glycolysis,and increases lipogenesis.
In adipose tissue,it enhances the membrane transfer of glucose and promotes lipogenesis.

(A) The pancreas acts as a composite gland,functioning as both an exocrine and an endocrine gland.
The endocrine part of the pancreas consists of the Islets of Langerhans,which contain different types of cells that secrete specific hormones:
$1$. $\alpha$-cells (alpha cells) secrete the hormone Glucagon,which increases blood glucose levels.
$2$. $\beta$-cells (beta cells) secrete the hormone Insulin,which decreases blood glucose levels.
$3$. $\delta$-cells (delta cells) secrete the hormone Somatostatin,which inhibits the secretion of both insulin and glucagon.
Therefore,the correct mapping is $A-Glucagon, B-Insulin, C-Somatostatin$.

(C) Alloxan is a toxic glucose analogue that selectively destroys insulin-producing beta cells in the pancreas.
It is widely used in research to induce experimental diabetes mellitus in laboratory animals.
Therefore,treatment with alloxan leads to the destruction of the beta cells of the islets of Langerhans.

(D) Insulin is a peptide hormone secreted by the beta cells of the Islets of Langerhans in the pancreas.
It performs several metabolic functions:
$1$. It promotes the uptake of glucose by adipose tissue and stimulates the synthesis of fats (lipogenesis).
$2$. It promotes protein synthesis by facilitating the uptake of amino acids by liver and muscle cells.
$3$. It promotes glycogenesis,which is the conversion of glucose into glycogen in the liver and muscles.
Therefore,all the given options are correct functions of insulin.

(C) The pancreas is a heterocrine or mixed gland,meaning it functions as both an endocrine and an exocrine gland.
$1$. Exocrine function: It secretes digestive enzymes (like trypsin,lipase,and amylase) into the duodenum via the pancreatic duct.
$2$. Endocrine function: It secretes hormones (like insulin and glucagon) directly into the blood to regulate blood glucose levels.

(B) The pancreas is a compound (both exocrine and endocrine) elongated organ situated between the limbs of the $U$-shaped duodenum.
The exocrine portion of the pancreas secretes an alkaline pancreatic juice containing enzymes,not an acidic one.
The endocrine portion secretes hormones,insulin and glucagon.
Therefore,statements $I, II, III,$ and $V$ are correct,while statement $IV$ is incorrect because the pancreatic juice is alkaline,not acidic.
Thus,the correct option is $B$.

(B) The pancreas is a heterocrine (mixed) gland.
It functions as an exocrine gland by secreting pancreatic juice containing $6$ major types of digestive enzymes (trypsinogen,chymotrypsinogen,procarboxypeptidase,amylase,lipase,and nucleases).
It functions as an endocrine gland by secreting $2$ major hormones (insulin and glucagon) directly into the blood to regulate blood glucose levels.
Therefore,the correct sequence is $6$ enzymes and $2$ hormones.

(D) The $Pancreas$ is a unique organ that functions as both an endocrine and an exocrine gland.
As an exocrine gland,it secretes digestive enzymes into the duodenum through the pancreatic duct.
As an endocrine gland,it contains the $Islets$ of $Langerhans$,which secrete hormones like $Insulin$ and $Glucagon$ directly into the blood to regulate blood glucose levels.

(C) hypoglycemic hormone is one that lowers the blood glucose level in the body.
$1$. Insulin is secreted by the $\beta$-cells of the Islets of Langerhans in the pancreas.
$2$. It acts mainly on hepatocytes and adipocytes and enhances cellular glucose uptake and utilization.
$3$. As a result,there is a rapid movement of glucose from the blood to hepatocytes and adipocytes,resulting in decreased blood glucose levels (hypoglycemia).
$4$. Glucagon,cortisol,and aldosterone are hyperglycemic or have other metabolic functions,but they do not lower blood glucose levels.

(B) $Glucagon$ is a peptide hormone secreted by the $\alpha$-cells of the $Pancreas$.
It plays a major role in maintaining normal blood glucose levels.
$Glucagon$ acts mainly on the liver cells $(Hepatocytes)$ and stimulates $Glycogenolysis$ (breakdown of glycogen to glucose),resulting in an increased blood sugar level $(Hyperglycemia)$.
It also stimulates the process of $Gluconeogenesis$ (formation of glucose from non-carbohydrate sources),which also contributes to hyperglycemia.
However,$Glucagon$ reduces cellular glucose uptake and utilization.
Therefore,the statement that it increases cellular glucose uptake and utilization is incorrect.

(D) The pancreas acts as both an exocrine and an endocrine gland.
The endocrine part of the pancreas consists of the Islets of Langerhans, which contain different types of cells:
$1$. $\alpha$-cells (Alpha cells) secrete the hormone Glucagon, which increases blood glucose levels.
$2$. $\beta$-cells (Beta cells) secrete the hormone Insulin, which decreases blood glucose levels.
$3$. $\delta$-cells (Delta cells) secrete the hormone Somatostatin, which inhibits the release of both insulin and glucagon.
Therefore, the correct matching is:
$P$ ($\alpha$-cells) $\rightarrow$ $I$ (Glucagon)
$Q$ ($\beta$-cells) $\rightarrow$ $III$ (Insulin)
$R$ ($\delta$-cells) $\rightarrow$ $II$ (Somatostatin)
Thus, the correct sequence is $(P-I), (Q-III), (R-II)$.

(B) Hyperglycemia refers to an abnormally high level of glucose in the blood.
Diabetes mellitus is a metabolic disorder characterized by persistent hyperglycemia,which occurs due to the deficiency or ineffective action of the hormone insulin.
Diabetes insipidus is caused by a deficiency of $ADH$ (vasopressin).
Addison's disease is caused by the under-secretion of adrenal cortex hormones.
Graves' disease is a form of hyperthyroidism.
Therefore,the correct option is $B$.

(B) Glucagon is a peptide hormone secreted by the $\alpha$-cells of the Islets of Langerhans in the pancreas.
It plays a crucial role in maintaining blood glucose levels.
Glucagon acts mainly on the liver cells (hepatocytes) and stimulates glycogenolysis (breakdown of glycogen to glucose), resulting in an increased blood sugar level.
Therefore, it is known as a hyperglycemic hormone.

(C) $Glucagon$ is a peptide hormone secreted by the $\alpha$-cells of the $Islets$ $of$ $Langerhans$ in the pancreas.
It acts mainly on the liver cells (hepatocytes) and stimulates $glycogenolysis$ (the breakdown of glycogen into glucose).
This process increases the blood glucose level, a condition known as $hyperglycemia$.
Therefore, $Glucagon$ is considered a hyperglycemic hormone.

(A) Insulin is a peptide hormone secreted by the $\beta$-cells of the Islets of Langerhans in the pancreas.
It plays a major role in the regulation of glucose homeostasis in the blood.
Insulin acts mainly on hepatocytes and adipocytes and enhances cellular glucose uptake and utilisation.
As a result,there is a rapid movement of glucose from the blood to hepatocytes and adipocytes,resulting in decreased blood glucose levels (hypoglycemia).
Therefore,insulin is called a hypoglycemic hormone.
Since the reason explains why insulin is hypoglycemic,both $A$ and $R$ are true and $R$ is the correct explanation of $A$.

(C) . The endocrine part of the pancreas is the islets of Langerhans,while the exocrine part secretes pancreatic enzymes.
$B$. Alpha cells of the islets secrete glucagon,whereas delta cells secrete somatostatin.
$C$. Somatostatin is a hormone that inhibits the secretion of both glucagon and insulin,making this the correct statement.
$D$. Bile pigments (bilirubin and biliverdin) impart colour to faecal matter,not pancreatic juice.

(A) Type $I$ Diabetes Mellitus $(IDDM)$,also known as insulin-dependent diabetes mellitus,is an autoimmune condition.
It occurs due to the destruction of beta cells in the Islets of Langerhans of the pancreas.
This destruction leads to a severe deficiency or complete lack of insulin secretion.
Since insulin is required to facilitate the uptake of glucose by cells,its absence leads to high blood glucose levels,known as hyperglycemia.

(D) The Islets of Langerhans contain different types of endocrine cells:
$1$. Alpha cells $(A)$ secrete glucagon,which stimulates the liver to perform glycogenolysis (breakdown of glycogen to glucose),matching with $IV$.
$2$. Beta cells $(B)$ secrete insulin,which stimulates cells (including muscles) to take up glucose and promotes glycogenesis (formation of glycogen),matching with $I$.
$3$. Delta cells $(C)$ secrete somatostatin,which inhibits the release of other pancreatic hormones and also decreases gastric secretions and absorption in the digestive tract,matching with $II$.
$4$. $F$ cells (or $PP$ cells) $(D)$ secrete pancreatic polypeptide,which inhibits the release of pancreatic juice,matching with $III$.
Therefore,the correct matching is $A-IV, B-I, C-II, D-III$.

(B) The pancreas acts as both an exocrine and an endocrine gland. The endocrine part consists of the Islets of Langerhans.
These islets contain different types of cells,primarily $\alpha$-cells and $\beta$-cells.
The $\alpha$-cells secrete a hormone called glucagon,which increases blood glucose levels.
The $\beta$-cells secrete a hormone called insulin,which plays a major role in the regulation of glucose homeostasis by lowering blood glucose levels.
Therefore,the correct answer is insulin.