Problem 30 - Objective Biology for NEET

Question

stimulates the synthesis and secretion of hormone called androgens from testis. (a) FSH (b) ACTH (c) \(\mathrm{LH}=\mathrm{ICSH}\) (d) GH

Step-by-Step Solution

Answer

The correct answer is (c) LH=ICSH.

Step 1: Identify The Function of Each Hormone

FSH (Follicle Stimulating Hormone) is primarily responsible for the growth and development of ovarian follicles in females and spermatogenesis in males. ACTH (Adrenocorticotropic Hormone) stimulates the adrenal glands to produce and release cortisol. LH (Luteinizing Hormone), in males, stimulates Leydig cell production of testosterone. GH (Growth Hormone) stimulates growth and cell reproduction.

Step 2: Match the Function to the Exercise Statement

By comparing the functions identified in step 1 to the statement in the exercise, it’s noted that LH in males stimulates the Leydig cells to produce testosterone, an androgen.

Key Concepts

Leydig Cells

Leydig cells are specialized cells located in the testes. They play a crucial role in male reproductive health by producing and secreting male sex hormones, known as androgens. These cells are found within the interstitial spaces between the seminiferous tubules of the testes.
These cells are activated by hormones to perform their function of hormone synthesis.

• Located between seminiferous tubules in the testes.
• Responsible for producing androgens, mainly testosterone.
• Acted upon by Luteinizing Hormone (LH) to stimulate this process.

Leydig cells are essential in the process of male sexual development and the maintenance of male secondary sex characteristics such as facial hair, deep voice, and muscular build. Their functionality is vital for proper male fertility and overall male endocrine health.

Luteinizing Hormone

Luteinizing Hormone (LH) is a key hormone in the regulation of the reproductive system. It is produced by the anterior pituitary gland and plays a central role in both male and female reproductive physiology. In males, LH has a specific role:

• Stimulates Leydig cells to produce testosterone by binding to receptors on the surface of these cells.
• Involved in the regulation of both testicular spermatogenesis and androgen production.
• Works hand-in-hand with Follicle Stimulating Hormone (FSH) to regulate male reproductive functions.

The relationship between LH and testosterone production is a key aspect of male hormonal balance, directly influencing fertility, muscle mass, and bone density. The blood levels of LH and testosterone are often checked in assessments of male reproductive health.

Testosterone Production

Testosterone is the primary male sex hormone responsible for the development and maintenance of male secondary sexual characteristics, as well as broader systemic effects.

• Produced by Leydig cells in the testes under the stimulation of Luteinizing Hormone (LH).
• Critical for the development of male reproductive tissues such as testes and prostate.
• Plays a role in boosting muscle and bone mass, as well as the growth of body hair.

In addition to its physical effects, testosterone is crucial for maintaining libido, energy levels, and overall mood. A delicate balance is necessary, as both deficient and excessive levels of testosterone can lead to health challenges. This hormone also plays a role in the synthesis of red blood cells and the regulation of fat distribution. Proper function of testosterone production is essential for overall male health and well-being.