Which hormone is made by the interstitial cells of the testis?

Correct Answer: B

Rationale: Certainly. The correct answer is B: Testosterone. Interstitial cells of the testis, also known as Leydig cells, synthesize and secrete testosterone. Testosterone is the primary male sex hormone responsible for the development of male reproductive tissues and characteristics. Estrogen (A) is primarily produced in the ovaries in females. Human chorionic gonadotropin (hCG) (C) is produced by the placenta during pregnancy. Luteinizing hormone (LH) (D) is secreted by the anterior pituitary gland and stimulates the interstitial cells to produce testosterone.

Correct Answer: D

Rationale: The correct answer is D: orchiditis. Orchiditis refers to inflammation of the testicle, which is a type of tissue found in the male reproductive system. This condition specifically affects the testicular tissue, leading to pain, swelling, and possible complications. Skeletal muscle (choice A) is not related to the testicle, phimosis (choice B) is a condition of the foreskin, and epithelial tissue (choice C) primarily covers the surface of organs, not the testicle itself. Therefore, orchiditis is the most relevant choice for a condition affecting testicular tissue.

Correct Answer: A

Rationale: The correct answer is A. The hormone produced by the corpus luteum that helps maintain pregnancy is progesterone. After ovulation, the ruptured follicle forms the corpus luteum, which secretes progesterone to support the uterine lining for potential implantation. Choice B is incorrect as cleavage refers to early cell divisions in embryo development. Choice C is incorrect as fertilization is the fusion of sperm and egg. Choice D is incorrect as estrogen is primarily produced by the ovaries.

Correct Answer: A

Rationale: The correct answer is A because a spermatid is a mature male germ cell that arises from the process of spermatogenesis, not a secondary sex characteristic. - B is incorrect as a primary spermatocyte is indeed typical of males in the process of spermatogenesis. - C is incorrect as a secondary spermatocyte is an intermediate stage in spermatogenesis. - D is incorrect as deepening voice is a secondary sex characteristic associated with male puberty.

Correct Answer: D

Rationale: The correct answer is D: dilation stage. This is the stage of labor where the cervix dilates to allow for the passage of the baby through the birth canal. This stage is crucial for the progression of labor and eventual delivery of the infant. Option A, relaxin, is a hormone that helps soften the cervix and pelvic ligaments but is not directly related to the stage of labor mentioned. Option B, progesterone, is a hormone involved in maintaining pregnancy and preparing the uterus for implantation, not specifically related to the dilation stage. Option C, chorion, is a membrane surrounding the fetus and plays a role in nutrient exchange, not directly related to the dilation stage of labor.