The hormone that is released from the testes is ______.

Correct Answer: C

Rationale: The correct answer is C: Testosterone. Testosterone is the primary male sex hormone produced by the testes. It plays a crucial role in the development of male reproductive tissues and secondary sexual characteristics. Progesterone (A) is a female sex hormone produced in the ovaries, not the testes. Vasopressin (B) is a hormone produced by the pituitary gland, not the testes. "None of the above" (D) is incorrect as testosterone is indeed released from the testes.

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: a diploid fertilized ovum. A zygote is formed when a sperm fertilizes an ovum, resulting in a diploid cell with a complete set of chromosomes. This marks the beginning of a new individual. A) Incorrect: An ovum is a haploid cell produced by the female reproductive system. B) Incorrect: A secondary oocyte is a haploid cell that has undergone meiosis II but has not been fertilized yet. D) Incorrect: A polar body is a haploid cell that is produced during oogenesis and eventually disintegrates.

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.