Each menstrual cycle is considered as a period of ________

Correct Answer: A

Rationale: The correct answer is A: 28 days because the average menstrual cycle length is typically around 28 days, although it can vary. The menstrual cycle consists of different phases such as menstruation, follicular phase, ovulation, and luteal phase, which collectively last around 28 days on average. Choice B (30 days), C (42 days), and D (14 days) are incorrect because they do not represent the typical duration of a menstrual cycle. It's important to note that individual variations in cycle length are common, but 28 days is considered a standard reference point.

Correct Answer: B

Rationale: The correct answer is B: Vulva. The term "vener/o" specifically refers to the external female genitalia, which includes the labia, clitoris, vaginal opening, and other structures collectively known as the vulva. The term does not refer to the vagina (A), which is the internal canal leading to the cervix. It also does not refer to sexual intercourse (C), which is the act of engaging in sexual activity. Lastly, it is not related to the hymen (D), which is a thin membrane partially covering the vaginal opening. Therefore, based on the definition and context of the term "vener/o," the correct answer is B: Vulva.

Correct Answer: D

Rationale: The correct answer is D, Testosterone. The luteinizing hormone acts on the interstitial cells in the testes to stimulate the production of testosterone. Testosterone is a male sex hormone responsible for the development of male reproductive tissues and characteristics. Androgen (choice A) is a broad term that includes testosterone, so it is not specific enough. Estrogen (choice B) and Progestin (choice C) are female sex hormones and are not produced by the interstitial cells in response to luteinizing hormone. Hence, the correct answer is D.

Correct Answer: B

Rationale: The correct answer is B: Periosteum. The periosteum is the outer fibrous vascular membrane that covers the surface of a long bone. It plays a crucial role in bone growth, repair, and nutrition. The endomysium (A) is a connective tissue sheath that surrounds individual muscle fibers, not bones. The perimysium (C) is a connective tissue sheath that surrounds bundles of muscle fibers, not bones. The endosteum (D) is a thin membrane that lines the inner surface of bones, not the outer surface. Therefore, the periosteum is the correct choice for the outer fibrous vascular membrane covering a long bone.

Correct Answer: D

Rationale: The correct answer is D: Depression. Sella turcica is a saddle-shaped depression in the sphenoid bone that houses the pituitary gland. It is not a groove (B) as it is a deeper concavity. It is not a projection (C) as it is a recessed area rather than a raised structure. It is not a foramen (A) as it is a hollowed-out area rather than a small opening. Therefore, the most accurate description of sella turcica is a depression in the sphenoid bone.