ICSH acts on(a) Spermatogonia(b) Nurse cells(c) Leydig cells(d) Primary spermatocytes

The correct answer is (b) Nurse cells.
Detailed Explanation:
ICSH (Interstitial Cell Stimulating Hormone) is a hormone that is part of the pituitary gonadotropin family and plays an important role in male reproductive physiology.
• ICSH is another name for Luteinizing Hormone (LH) in males.
• In males, ICSH (LH) primarily acts on Leydig cells, which are located in the testes. The function of ICSH is to stimulate these cells to produce testosterone, a crucial hormone for the development of male secondary sexual characteristics and the regulation of spermatogenesis.
However, the options provided in the question seem to be a little mixed up regarding the specific target of ICSH.
• (a) Spermatogonia: These are the male germ cells that undergo division to form sperms, but ICSH does not directly act on spermatogonia.
• (b) Nurse cells: This option is misleading as ICSH primarily stimulates Leydig cells, not the Sertoli (or Nurse) cells. Sertoli cells are responsible for nurturing and supporting sperm development but are mainly influenced by Follicle-Stimulating Hormone (FSH).
• (c) Leydig cells: These are the correct target of ICSH, where the hormone stimulates the production of testosterone.
• (d) Primary spermatocytes: ICSH does not act directly on primary spermatocytes, as these are involved in the process of spermatogenesis, but they are regulated by testosterone indirectly through Sertoli cells.
ICSH acts primarily on Leydig cells to stimulate the production of testosterone. The correct answer is (c) Leydig cells.