What is the first structure to receive the oocyte?

Correct Answer: A

Rationale: The correct answer is A: fimbriae. Fimbriae are finger-like projections at the end of the fallopian tube that capture the released oocyte from the ovary during ovulation. The fimbriae create a gentle sweeping motion to guide the oocyte into the uterine tube for fertilization. The other choices are incorrect because the oocyte needs to be captured by the fimbriae before entering the uterine tube, infundibulum, or uterus. The fimbriae are the initial structure responsible for receiving the oocyte, making choice A the correct answer.

Correct Answer: C

Rationale: The correct answer is C: inner cell mass. After fertilization, the zygote undergoes several cell divisions to form a hollow ball of cells called a blastocyst. Within the blastocyst, the inner cell mass contains cells that will develop into the fetus. The morula is an earlier stage consisting of a solid ball of cells. The zygote is the initial cell formed from the fusion of egg and sperm, but it does not directly become the fetus. Therefore, the inner cell mass is the structure that will actually develop into the fetus, making it the correct answer.

Correct Answer: C

Rationale: The correct answer is C: Digestive enzymes. The acrosome is a specialized organelle found in the head of sperm cells and is filled with enzymes that are crucial for fertilization. These enzymes help the sperm penetrate the outer layers of the egg during fertilization. Choice A (Lipids) is incorrect because the acrosome primarily contains enzymes, not lipids. Choice B (Hormones) is incorrect as hormones are not stored in the acrosome. Choice D (None of the above) is incorrect as the acrosome does indeed contain digestive enzymes essential for the sperm's fertilization process.

Correct Answer: C

Rationale: The correct answer is C: Seminal vesicles. These glands are located posterior to the bladder and anterior to the rectum. They secrete an alkaline fluid rich in fructose, which nourishes and supports sperm viability. The other choices are incorrect because: A) The prostate is located below the bladder and surrounds the urethra, secreting a milky fluid; B) The bulbourethral gland is located below the prostate and secretes a clear, viscous fluid; D) The spongy urethra is a part of the male urethra that runs through the penis, responsible for transporting urine and semen.

Correct Answer: C

Rationale: The correct answer is C: Proliferative phase. During this phase, the endometrium thickens in preparation for a potential implantation of a fertilized egg. This phase occurs after the menstrual phase and before ovulation, marking the time when the ovarian follicles are developing under the influence of FSH. The other choices are incorrect because the menstrual phase (A) refers to the shedding of the endometrium, the preovulatory phase (B) occurs just before ovulation, and the follicular phase (D) includes both the menstrual and preovulatory phases.