What results from spermiogenesis? ________.

Correct Answer: C

Rationale: Spermiogenesis is the process of spermatid maturation into spermatozoa. During this process, each spermatid transforms into a single sperm cell. Therefore, the correct answer is C: four spermatids, as spermiogenesis results in the formation of four mature sperm cells from each spermatid. A: Four spermatogonia are the cells that undergo mitosis to produce spermatocytes, not the result of spermiogenesis. B: Emission refers to the release of semen during ejaculation, not the result of spermiogenesis. D: Menses is the shedding of the uterine lining during the menstrual cycle in females, not related to spermiogenesis.

Correct Answer: D

Rationale: The correct answer is D: 3 hours. After ejaculation, sperm needs to travel through the female reproductive tract to reach the site of fertilization in the fallopian tube. This journey typically takes around 3 hours due to the distance and obstacles the sperm must overcome. Choice A (2 mins) is too short for sperm to travel such a distance. Choice B (20 mins) is also insufficient for the journey. Choice C (60 mins) is closer but still underestimates the time required for sperm to reach the fallopian tube.

Correct Answer: B

Rationale: The correct answer is B because mechanical stimulation and neural inputs do not directly stimulate the anterior pituitary to secrete prolactin releasing factor and oxytocin. The release of prolactin is primarily controlled by the hypothalamus through the release of prolactin inhibitory hormone (dopamine) and prolactin releasing hormone. Oxytocin release is controlled by the hypothalamus in response to suckling. Choices A, C, and D are all correct statements about lactation. Plasma prolactin releasing factor (prolactin releasing hormone) does stimulate the release of prolactin, plasma oxytocin does stimulate milk ejection, and progesterone does prepare the mammary glands for lactation.

Correct Answer: C

Rationale: The correct answer is C: Cervix. The cervix is the inferior portion of the uterus that consists of two parts (supravaginal, vaginal), two openings (internal os, external os), and a cervical canal. The clitoris (A) is a small sensitive organ located at the top of the vulva. The ovary (B) is a female reproductive organ that produces eggs and hormones. Implantation (D) refers to the attachment of a fertilized egg to the uterine lining, not a specific anatomical structure within the uterus. The cervix clearly fits the description provided, making it the correct answer.

Correct Answer: A

Rationale: The correct answer is A: cervicitis. Cervicitis specifically refers to inflammation of the cervix, often due to an infection. Vaginitis (B) is inflammation of the vagina, not the cervix. Cercicopathy (C) is not a medical term. Vaginoplasty (D) is a surgical procedure to reconstruct or tighten the vagina, unrelated to inflammation or infection of the cervix.