The spermatozoon contains:

Correct Answer: D

Rationale: The correct answer is D because the spermatozoon contains the Y sex chromosome, determining male characteristics. Sperm cells are haploid and carry only one set of chromosomes, including either an X or Y sex chromosome. The presence of the Y chromosome leads to the development of male offspring. Choice A is incorrect as sperm cells do not contain somatic chromosomes. Choice B is incorrect as sperm cells contain one pair of sex chromosomes, not just one. Choice C is incorrect because sperm cells can carry either the X or Y sex chromosome, not specifically the X chromosome.

Correct Answer: A

Rationale: The correct answer is A because Fallopian tubes are indeed funnel-shaped, with edges flared towards the uterus. This shape helps capture the released egg from the ovary and guide it towards the uterus for potential fertilization. The other choices are incorrect because the medial extremity does not display flares (B), the Fallopian tube is not directly linked to the uterus through the uterine ostium (C), and the lateral extremity does not open in the abdominal cavity (D). Therefore, choice A is the most accurate description of the Fallopian tubes based on their anatomy and function.

Correct Answer: C

Rationale: Step-by-step rationale: 1. The mammary gland is not an erectile organ, eliminating choice A. 2. It is not part of the internal genital organs, ruling out choice B. 3. The mammary gland is indeed an accessory gland of the female reproductive system, making choice C correct. 4. Lastly, the mammary gland is a pair of organs, which supports choice D as incorrect. Therefore, choice C is correct as the mammary gland functions as an accessory gland in the female reproductive system.

Correct Answer: A

Rationale: Step 1: Testosterone is a hormone primarily produced by the testes in males, regulating sperm production. Step 2: Gametes are reproductive cells (sperm in males), crucial for the reproductive cycle. Step 3: Therefore, the presence of testosterone regulating gamete production in a male is a normal part of the reproductive cycle. Summary: - Option B is incorrect as estrogen, a female sex hormone, does not produce sperm. - Option C is incorrect as progesterone is a hormone mainly involved in the menstrual cycle and pregnancy, not in males. - Option D is incorrect as insulin is a hormone related to glucose metabolism, not directly involved in the reproductive cycle.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.