Match List - I with List - II.

List - I	List - II
A. Heart	I. Erythropoietin
B. Kidney	II. Aldosterone
C. Gastro-intestinal tracts	III. Atrial natriuretic Factor
D. Adrenal Cortex	IV. Secretin

Choose the correct answer from the options given below: 

The correct answer is A-III, B-I, C-IV, D-II

Explanation:

A. Heart - III. Atrial Natriuretic Factor (ANF):

• The atrial wall of our heart secretes a very important peptide hormone called atrial natriuretic factor (ANF), which decreases blood pressure.
• When blood pressure is increased, ANF is secreted which causes dilation of the blood vessels. This reduces the blood pressure.
• ANF helps regulate blood pressure and fluid balance by promoting sodium excretion and reducing water reabsorption in the kidneys.
• This hormone counteracts the effects of aldosterone and reduces blood volume, thereby lowering blood pressure.

B. Kidney - I. Erythropoietin:

• The juxtaglomerular cells of kidney produce a peptide hormone called erythropoietin which stimulates erythropoiesis (formation of RBC).

C. Gastro-intestinal Tract - IV. Secretin:

• Endocrine cells present in different parts of the gastro-intestinal tract secrete four major peptide hormones, namely gastrin, secretin, cholecystokinin (CCK) and gastric inhibitory peptide (GIP).
• Secretin acts on the exocrine pancreas and stimulates secretion of water and bicarbonate ions.

D. Adrenal Cortex - II. Aldosterone:

• The adrenal cortex produces aldosterone, a steroid hormone that is part of the mineralocorticoid group.
• Aldosterone regulates sodium and potassium levels in the body by increasing sodium reabsorption and potassium excretion in the kidneys.
• This hormone is crucial for maintaining blood pressure and electrolyte balance.