Seminiferous tubules are lined with:

Correct Answer: D

Rationale: The correct answer is D: Sertoli cells. Seminiferous tubules are lined with Sertoli cells, which provide structural support and nourishment to developing sperm cells. These cells also help in the process of spermatogenesis. A: Oocytes are female germ cells found in the ovaries, not in the seminiferous tubules. B: Red blood cells are not found in the seminiferous tubules. They are responsible for carrying oxygen in the bloodstream. C: Leydig cells are found in the interstitial tissue of the testes and are responsible for producing testosterone, not lining the seminiferous tubules. Therefore, the correct choice is D as Sertoli cells play a crucial role in sperm production within the seminiferous tubules.

Correct Answer: B

Rationale: The correct answer is B because oestrogen levels in females rise and fall every month in response to the menstrual cycle. This hormone is produced by the ovaries and plays a key role in regulating the menstrual cycle. During the menstrual cycle, oestrogen levels increase during the first half of the cycle (follicular phase), peak around ovulation, and then decrease in the second half of the cycle (luteal phase). This cyclical pattern is essential for preparing the uterus for potential pregnancy. Choices A, C, and D are incorrect because oestrogen levels do not follow a continuous decline throughout a female's life, peak during gestation, or reach their highest level just after birth.

Correct Answer: B

Rationale: The correct answer is B: fallopian tubes. Fertilization occurs in the fallopian tubes where the sperm meets the egg. The fallopian tubes are where the egg is released from the ovary and where fertilization takes place. The uterus (choice A) is where the fertilized egg implants and develops into a fetus. The labia (choice C) are external genital structures and do not play a role in fertilization. The vagina (choice D) is the birth canal and does not directly participate in fertilization. Therefore, the fallopian tubes are the correct choice for the site of fertilization in the female reproductive system.

Correct Answer: A

Rationale: The correct answer is A: mammoplasty. "Mammo-" refers to the breast, and "-plasty" indicates surgical repair or reconstruction. This term specifically denotes surgical fixation of the breast(s). B: Mastopexy refers to a breast lift, not fixation. C: Hysteropexy involves fixing the uterus, not the breast. D: Vaginoplasty refers to surgical reconstruction of the vagina, not the breast.

Correct Answer: D

Rationale: The rete testis interposes between the seminiferous tubules and the efferent ducts in the male reproductive system. The correct answer is D because the rete testis acts as a connection between the seminiferous tubules where sperm is produced and the efferent ducts that transport the sperm out of the testes. The other choices (A, B, and C) are incorrect because they do not accurately describe the anatomical relationship between the rete testis and the structures mentioned.