Physiology MCQs – Endocrine Physiology [MBBS]


Physiology (MCQs) – Endocrine Physiology



1. The concentration of ionized calcium in plasma is

A. The main regulator of parathormone secretion.

B. Less than the free ionized calcium concentration in intracellular fluid.

C. About 50 per cent of the total plasma calcium concentration.

D. Reduced when plasma pH rises.

E. Reduced when the plasma protein level rises.


2. Cortisol

A. Is bound in the plasma to an alpha globulin.

B. Is inactivated in the liver and excreted in the bile.

C. Injections lead to a rise in arterial pressure.

D. Inhibits release of ACTH from the anterior pituitary gland.

E. Is released with a circadian variation so that cortisol blood levels peak in the morning.


3. When secretory activity in the thyroid gland increases

A. The gland takes up iodide from the blood at a faster rate.

B. Its follicles enlarge and fill with colloid.

C. The follicular cells become more columnar.

D. The follicular cells ingest colloid by endocytosis.

E. The blood level of thyrotropin (TSH) increases.


4.  Releasing hormones produced in the hypothalamus

A. Are secreted by cells in the median eminence.

B. Pass down nerve axons to reach the pituitary gland.

C. May control the output of more than one pituitary hormone.

D. Regulate the release of thyrotropin.

E. Regulate the release of oxytocin.


5. Adrenaline secretion from the adrenal glands increases the

A. Blood glucose level

B. Blood free fatty acid level.

C. Blood flow to skeletal muscle.

D. Blood flow to the splanchnic area.

E. Release of renin in the kidneys


6. Thyroid-stimulating hormone (TSH) secretion is increased

A. After partial removal of the thyroid gland.

B. In infants born without a thyroid gland.

C. When metabolic rate falls.

D. In starvation.

E. When the diet is deficient in iodine.

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