Foetal portion of placenta includes

Correct Answer: B

Rationale: The correct answer is B: Chorion frondosum. The foetal portion of the placenta is formed by the chorion frondosum, which consists of the chorionic villi that develop from the trophoblast. These villi are involved in the exchange of nutrients and waste products between the mother and the foetus. A: Decidua parietalis is the maternal portion of the placenta, not the foetal portion. C: Decidua basalis is also part of the maternal portion, not the foetal portion. D: Anchoring villi are structures that help anchor the placenta to the uterine wall, but they are not specific to the foetal portion. In summary, the correct answer is B because the chorion frondosum is specifically responsible for the foetal part of the placenta, while the other choices refer to maternal components or structures not directly related to the foetal portion.

Correct Answer: B

Rationale: The epididymis directs sperm cells into the vas deferens. Sperm mature in the epididymis and are stored there until ejaculation. The vas deferens then carries the mature sperm from the epididymis to the urethra for ejaculation. The other choices are incorrect because the vas efferens carries sperm from the rete testis to the epididymis, the rete testis is a network of tubules where sperm is collected from the seminiferous tubules, and the prostate gland secretes fluids that contribute to semen but does not direct sperm flow.

Correct Answer: D

Rationale: The correct answer is D: dihydrotestosterone. Testosterone is converted to dihydrotestosterone (DHT) in the prostate by the enzyme 5-alpha reductase. DHT is a more potent androgen that plays a crucial role in prostate growth and development. Choice A (cholesterol) is incorrect as it is not a product of testosterone conversion in the prostate. Choice B (estrogen) is incorrect as testosterone is not directly converted to estrogen in the prostate. Choice C (progesterone) is incorrect as progesterone is not the main product of testosterone conversion in the prostate.

Correct Answer: C

Rationale: The correct answer is C: fundus. The fundus is the superior portion of the uterus, located above the entry point of the fallopian tubes. It is the part of the uterus where the fertilized egg implants and grows during pregnancy. The body of the uterus (choice A) is the main central portion, the cervix (choice B) is the lower narrow part that connects to the vagina, and the infundibulum (choice D) is a part of the fallopian tube, not the uterus. Thus, the fundus is the correct choice as it specifically refers to the superior portion of the uterus.

Correct Answer: B

Rationale: The correct answer is B: LH levels. Ovulation is triggered by a surge in luteinizing hormone (LH) levels, which causes the release of the mature egg from the ovary. LH surge is a key event in the menstrual cycle that leads to ovulation. Explanation: 1. LH surge stimulates the release of the egg from the dominant follicle in the ovary. 2. This surge typically occurs around the middle of the menstrual cycle. 3. Ovulation occurs within 24-36 hours after the LH surge. 4. FSH (Choice C) is involved in follicle development but does not directly cause ovulation. 5. Estrogen (Choice D) plays a role in the menstrual cycle but does not directly trigger ovulation. 6. Blood pressure (Choice A) is not involved in the process of ovulation. Summary: LH levels are the primary factor that causes ovulation by triggering the release of the egg from the ovary