Which hormone is secreted by the corpus luteum after ovulation?

Correct Answer: A

Rationale: The correct answer is A: Progesterone. After ovulation, the corpus luteum forms from the ruptured follicle and secretes progesterone to prepare the uterus for implantation. Progesterone helps maintain the endometrial lining for potential pregnancy. Choice B, Relaxin, is secreted by the corpus luteum, but its main function is to soften the cervix and pubic symphysis. Choices C and D, LH and FSH respectively, are pituitary hormones involved in the menstrual cycle regulation, not directly secreted by the corpus luteum.

Correct Answer: C

Rationale: The correct answer is C: Hymen. The hymen is a mucous membrane that partially or completely covers the vaginal orifice. It is a thin tissue located at the opening of the vagina. The hymen can vary in appearance and may partially cover the vaginal opening, making it an essential anatomical structure to consider. The other choices are incorrect because: A: Clitoris - The clitoris is a highly sensitive sexual organ located above the vaginal opening, not covering it. B: Labia - The labia are the folds of skin surrounding the vaginal opening, not covering it entirely. D: Vulva - The vulva refers to the external female genitalia, including the labia, clitoris, and vaginal opening, but it does not specifically refer to the mucous membrane covering the vaginal orifice.

Correct Answer: C

Rationale: The correct answer is C: Nullipara. Nullipara refers to a woman who has never given birth to a child. "Nulli-" means none or zero, and "-para" refers to giving birth. This term specifically indicates the absence of any childbirth experience, regardless of pregnancy history. A: Primipara would refer to a woman who has given birth to one child. B: Nulligravida would refer to a woman who has never been pregnant. D: Primigravida would refer to a woman who is pregnant for the first time. Therefore, C is the correct choice as it accurately describes a woman who has not experienced childbirth.

Correct Answer: C

Rationale: The correct answer is C, Herpes. Herpes is a viral infection caused by the herpes simplex virus, not a bacterial infection. Chlamydial (A), Gonorrhea (B), and Syphilis (D) are all bacterial infections caused by specific bacteria. Therefore, Herpes does not fit the category of bacterial infections, making it the correct choice.

Correct Answer: B

Rationale: The correct answer is B: Fossa. A fossa is a hollow cavity or depression within a bone. It serves as an attachment site for muscles, ligaments, or tendons. Sulcus (A) is a groove or furrow, not a hollow cavity in a bone. Fissure (C) is a narrow opening or cleft, not a hollow cavity. Sinus (D) is a cavity within a bone filled with air, not necessarily hollow. Therefore, the best choice for a hollow cavity within a bone is a fossa.