What hormone increases the permeability of the cervix to sperm during ovulation?

Correct Answer: A

Rationale: Estrogen is the correct answer because it increases the permeability of the cervix to sperm during ovulation. Estrogen is responsible for the changes in cervical mucus consistency, making it easier for sperm to swim through to reach the egg. Progesterone, FSH, and LH do not directly affect cervical mucus permeability during ovulation. Progesterone prepares the uterine lining for implantation, FSH stimulates follicle growth, and LH triggers ovulation.

Correct Answer: A

Rationale: The correct answer is A: Testosterone. Testosterone is the primary male sex hormone responsible for the development of secondary sexual characteristics such as facial hair, deepening of the voice, and muscle growth. It is produced by the testes in males. Estrogen (B) and Progesterone (C) are female sex hormones, while LH (D) is luteinizing hormone that stimulates the production of testosterone in males but is not responsible for the development of secondary sexual characteristics.

Correct Answer: C

Rationale: The correct answer is C because the fallopian tubes transport the ovum from the ovary to the uterus for fertilization. This is their primary function in the reproductive system. Choice A is incorrect because the ovaries produce eggs, not the fallopian tubes. Choice B is incorrect as the fallopian tubes do not transport sperm but rather the egg. Choice D is also incorrect because estrogen is produced by the ovaries and other tissues, not by the fallopian tubes. In summary, the fallopian tubes serve as a pathway for the ovum to travel from the ovary to the uterus for potential fertilization.

Correct Answer: C

Rationale: Estrogen's primary function is to stimulate the development of female secondary sexual characteristics such as breast development and widening of the hips. This is crucial for the maturation of the female reproductive system. Estrogen does not directly regulate ovulation (choice A), support pregnancy (choice B), or control the menstrual cycle (choice D). Ovulation is mainly regulated by luteinizing hormone and follicle-stimulating hormone, pregnancy is supported by progesterone, and the menstrual cycle is under the control of various hormones including estrogen and progesterone.

Correct Answer: B

Rationale: The main function of the testes in males is to produce sperm. Sperm production, known as spermatogenesis, occurs within the seminiferous tubules of the testes. Testosterone is primarily secreted by the Leydig cells in the testes, not the main function. Storing sperm is not a primary function, as sperm is continuously produced and released. Transporting sperm is mainly done by the vas deferens, not the testes themselves. Therefore, the correct answer is B, as it directly relates to the primary function of the testes in males.