NEET 2025 MCQ with Answer Explanation : Chemical coordination and Integration.

Question 61:
Which hormone is released during hypoglycemia to increase blood sugar levels?

A) Insulin
B) Glucagon
C) Thyroxine
D) Cortisol

Answer: B) Glucagon

Explanation: Glucagon is secreted by the pancreas in response to low blood sugar levels and promotes the release of glucose into the bloodstream.

Question 62:
What is the role of the hormone aldosterone?

A) Increases blood sugar levels
B) Regulates sodium and potassium balance
C) Stimulates growth
D) Affects metabolism

Answer: B) Regulates sodium and potassium balance

Explanation: Aldosterone is produced by the adrenal cortex and regulates sodium reabsorption and potassium excretion in the kidneys.

Question 63:
Which of the following hormones is associated with the body’s response to stress?

A) Melatonin
B) Adrenaline
C) Thyroxine
D) Insulin

Answer: B) Adrenaline

Explanation: Adrenaline is released in response to stress and is involved in the fight-or-flight response, increasing heart rate and blood flow to muscles.

Question 64:
Which hormone is known as the “stress hormone”?

A) Cortisol
B) Estrogen
C) Insulin
D) Progesterone

Answer: A) Cortisol

Explanation: Cortisol is known as the “stress hormone” because it is released in response to stress and helps regulate various bodily functions during stressful situations.

Question 65:
What is the primary role of the hormone insulin?

A) Increases blood sugar levels
B) Decreases blood sugar levels
C) Regulates metabolism
D) Promotes fat storage

Answer: B) Decreases blood sugar levels

Explanation: Insulin decreases blood sugar levels by promoting the uptake of glucose into cells for energy.

Question 66:
Which gland produces calcitonin?

A) Adrenal gland
B) Thyroid gland
C) Pituitary gland
D) Pancreas

Answer: B) Thyroid gland

Explanation: Calcitonin is produced by the thyroid gland and helps regulate calcium levels in the blood.

Question 67:
Which hormone is produced by the ovaries and is crucial for maintaining pregnancy?

A) Testosterone
B) Progesterone
C) Estrogen
D) Oxytocin

Answer: B) Progesterone

Explanation: Progesterone helps maintain the uterine lining during pregnancy and is essential for successful gestation.

Question 68:
Which hormone is primarily responsible for stimulating the production of red blood cells?

A) Erythropoietin
B) Insulin
C) Thyroxine
D) Cortisol

Answer: A) Erythropoietin

Explanation: Erythropoietin is produced by the kidneys and stimulates the production of red blood cells in the bone marrow.

Question 69:
What is the role of the hormone prolactin?

A) Stimulates milk production
B) Regulates metabolism
C) Increases blood sugar levels
D) Stimulates growth

Answer: A) Stimulates milk production

Explanation: Prolactin is responsible for stimulating milk production in the mammary glands after childbirth.

Question 70:
Which hormone helps to lower blood pressure by promoting vasodilation?

A) Insulin
B) Adrenaline
C) Atrial natriuretic peptide (ANP)
D) Cortisol

Answer: C) Atrial natriuretic peptide (ANP)

Explanation: ANP is produced by the heart and helps lower blood pressure by promoting vasodilation and sodium excretion.