NEET Practice Questions (MCQs) with Answers & Solutions

Mineralocorticoids, such as aldosterone, are secreted by the Zona glomerulosa of the adrenal cortex. These hormones are crucial for maintaining electrolyte balance and blood pressure by regulating sodium and potassium levels in the blood.

In an emergency, the central nervous system (CNS) stimulates the adrenal gland. The CNS sends signals to the adrenal medulla, which then secretes adrenaline and noradrenaline to prepare the body for a 'fight or flight' response.

Diabetes mellitus is caused by the under secretion of insulin. Insulin is a hormone produced by the pancreas that helps to regulate blood sugar levels. When the body does not produce enough insulin, blood sugar levels remain high, leading to diabetes mellitus.

The thymus gland atrophies after puberty. It is very active during childhood and puberty, playing a crucial role in the development of the immune system. However, after puberty, it gradually shrinks and is replaced by fat.

MSH (Melanocyte-Stimulating Hormone) regulates the color of the skin by stimulating the production and release of melanin in melanocytes. This hormone is responsible for skin pigmentation. Therefore, the correct option is o1.

Follicle-stimulating hormone (FSH) is a gonadotropin, a glycoprotein polypeptide hormone. FSH is synthesized and secreted by the gonadotropic cells of the anterior pituitary gland, and regulates the development, growth, pubertal maturation, and reproductive processes of the body.

Insulin is the hormone that promotes glycogenesis, the process of converting glucose to glycogen for storage in the liver. Insulin helps lower blood glucose levels by facilitating the uptake of glucose into cells and stimulating glycogenesis. Therefore, the correct option is o2.

The correct path of Libido expression is: Leydig’s cell -----> Androgen -----> CNS -----> Libido. Leydig cells in the testes produce androgens (mainly testosterone), which then act on the central nervous system (CNS) to influence sexual drive or libido.

The corpus luteum is not considered a primary endocrine gland. Primary endocrine glands include the adrenal medulla, parathyroid gland, thymus, etc., which have the primary function of secreting hormones. The corpus luteum is a temporary endocrine structure involved in the menstrual cycle and early pregnancy but not classified as a primary endocrine gland.