1. Which of the following hormones is responsible for regulating calcium levels

in the blood?

a) Insulin

b) Thyroid stimulating hormone (TSH)

c) Parathyroid hormone (PTH)

d) Adrenaline

Answer: c) Parathyroid hormone (PTH)

Rationale: PTH is released by the parathyroid gland and helps to regulate

calcium levels in the blood by increasing the absorption of calcium from the

intestines and kidneys, as well as releasing calcium from bone.

2. Which of the following structures carries oxygenated blood from the lungs to

the heart?

a) Pulmonary artery

b) Aorta

c) Pulmonary vein

d) Renal vein

Answer: c) Pulmonary vein

Rationale: The pulmonary vein carries oxygenated blood from the lungs back

to the heart, specifically the left atrium.

3. Which of the following is NOT a function of the liver?

a) Detoxification of harmful substances

b) Production of bile

c) Storage of glycogen

d) Regulation of blood glucose levels

Answer: d) Regulation of blood glucose levels

Rationale: The pancreas is responsible for regulating blood glucose levels

through the release of insulin and glucagon, not the liver.

4. Which of the following is the primary function of red blood cells?

a) Transport of oxygen

b) Regulate blood pressure

c) Fight infection

d) Store nutrients

Answer: a) Transport of oxygen