Chemical Coordination and Integration MCQs

Read the statements regarding the Parathyroid Glands:

I. In humans, four parathyroid glands are present on the back side of the thyroid gland, one pair in each lobe.
II. They secrete a peptide hormone called Parathyroid Hormone (PTH).
III. The secretion of PTH is regulated by the circulating levels of calcium ions.
IV. The secretion of PTH is regulated by the circulating levels of thyroxine.

Choose the correct statement combination.

Read the statements regarding the mechanism of action of Parathyroid Hormone (PTH):

I. PTH increases the Ca²⁺ levels in the blood, acting as a hypercalcemic hormone.
II. PTH acts on bones and stimulates the process of bone resorption (dissolution/demineralisation).
III. PTH stimulates the reabsorption of Ca²⁺ by the renal tubules.
IV. PTH decreases Ca²⁺ absorption from digested food to prevent toxicity.

Which of the statements given above are correct?

Consider the following statements about the Thymus Gland and its location:

I. The thymus gland is a lobular structure.
II. It is located between the lungs behind the sternum on the dorsal side of the aorta.
III. It is located between the lungs behind the sternum on the ventral side of the aorta.
IV. It plays a major role in the development of the immune system.

Identify the correct statements.

Read the statements below regarding Thymosins and age-related changes of the thymus:

I. Thymosins play a major role in the differentiation of T-lymphocytes, providing cell-mediated immunity.
II. Thymosins promote the production of antibodies to provide humoral immunity.
III. The thymus gland is enlarged and becomes highly active in old individuals.
IV. Degeneration of the thymus gland in old individuals results in weakened immune responses.

Which of the statements given above are correct?

Read the following statements regarding the anatomical regions and secretions of the Adrenal Gland:

I. Our body has one pair of adrenal glands, one located above each kidney.
II. The centrally located tissue of the gland is the adrenal cortex, and the outer part is the adrenal medulla.
III. The centrally located tissue is the adrenal medulla, and the outer part is the adrenal cortex.
IV. The adrenal medulla secretes adrenaline (epinephrine) and noradrenaline (norepinephrine).

Select the correct statements.

Consider the statements regarding the division and histology of the adrenal cortex:

I. The adrenal cortex is divided into three distinct layers.
II. From the outer side to the inner side, the layers are: zona reticularis, zona fasciculata, and zona glomerulosa.
III. From the inner side to the outer side, the layers are: zona reticularis, zona fasciculata, and zona glomerulosa.
IV. The adrenal cortex secretes multiple steroid hormones commonly referred to as corticoids.

Which of the statements given above are correct?

Read the statements below regarding cortisol and glucocorticoid activity:

I. Corticoids that are primarily involved in carbohydrate metabolism are called glucocorticoids.
II. In the human body, aldosterone acts as the primary glucocorticoid.
III. In the human body, cortisol is the principal glucocorticoid.
IV. Cortisol plays an active role in stimulating gluconeogenesis, lipolysis, and proteolysis.

Identify the combination of correct statements.

Read the statements regarding the physiological, metabolic, and immunological roles of glucocorticoids:

I. Glucocorticoids stimulate the cellular uptake and utilization of amino acids by target cells.
II. Glucocorticoids inhibit the cellular uptake and utilization of amino acids by target cells.
III. Cortisol is actively involved in maintaining cardiovascular system integrity as well as normal kidney functions.
IV. Glucocorticoids, particularly cortisol, produce powerful anti-inflammatory reactions and suppress the immune response.

Which of the statements given above are correct?

Consider the statements regarding the regulation and function of mineralocorticoids:

I. Aldosterone is the main mineralocorticoid in the human body and regulates water and electrolyte balance.
II. Aldosterone acts mainly at the level of the renal tubules to stimulate the excretion of sodium ions (Na⁺) and water.
III. Aldosterone stimulates the reabsorption of sodium ions (Na⁺) and water, while promoting the excretion of potassium (K⁺) and phosphate ions.
IV. Aldosterone plays a vital role in maintaining electrolytes, body fluid volume, osmotic pressure, and blood pressure.

Select the correct statement combination.

Read the following statements regarding secondary sexual traits and adrenal cortex secretions:

I. The adrenal cortex secretes small amounts of androgenic steroids.
II. These adrenal androgenic steroids play an important role in the growth of axial hair, pubic hair, and facial hair during puberty.
III. These androgenic steroids are secreted exclusively by the adrenal medulla.
IV. Adrenal androgens are chemically peptide-based hormones.

Choose the correct statements.