Vener/o refers to:

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: 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.

Correct Answer: A

Rationale: The sacrum is formed by the fusion of 5 originally separate sacral vertebrae. However, the coccyx is the result of the fusion of 4 originally separate coccygeal vertebrae. Therefore, the sacrum itself is formed by the fusion of 4 parts, making choice A correct. Choices B, C, and D are incorrect as they do not accurately reflect the anatomical structure of the sacrum.

Correct Answer: D

Rationale: The correct answer is D: STDs. Sexually transmitted diseases (STDs) can lead to pelvic inflammatory disease (PID) which can cause scarring and blockage of the fallopian tubes, leading to female infertility. STDs such as chlamydia and gonorrhea can also cause damage to the reproductive organs, affecting fertility. Therefore, STDs are a significant factor contributing to female infertility. A: A cold is a common viral infection that does not directly impact female fertility. B: Lack of appetite is not a known cause of female infertility. C: Irregular menstrual cycles can be a symptom of hormonal imbalances but may not directly lead to infertility.