The contraction of the myoepithelial breast cells is stimulated by _____.

Correct Answer: C

Rationale: The correct answer is C: oxytocin. Myoepithelial cells contract to facilitate milk ejection during breastfeeding. Oxytocin is the hormone responsible for stimulating this contraction. Estrogen and progesterone are involved in breast development and preparing for lactation but do not directly stimulate myoepithelial cell contraction. Prolactin is responsible for milk production but does not directly trigger myoepithelial cell contraction.

Correct Answer: D

Rationale: The correct answer is D: Suspensory ligament. The suspensory ligament attaches the ovaries to the pelvic wall and also contains the ovarian artery, vein, and nerves. This structure supports and suspends the ovaries in the pelvic cavity. The broad ligament (A) is a sheet of peritoneum that connects the uterus, fallopian tubes, and ovaries to the pelvic wall. The mesovarium (B) is a fold of peritoneum that attaches the ovaries to the broad ligament. The ovarian ligament (C) attaches the ovaries to the uterus. Therefore, the suspensory ligament is the correct answer as it specifically connects the ovaries to the pelvic wall.

Correct Answer: D

Rationale: The correct answer is D: Ovarian medulla. Line "D" is pointing to the inner region of the ovary known as the medulla, which contains blood vessels, nerves, and connective tissue. This is confirmed by the location and characteristics of the structures in that region. Explanation: 1. Follicular fluid (Choice A) is found within the follicles in the ovarian cortex, not in the medulla. 2. Germinal epithelium (Choice B) is the outermost layer of the ovary, whereas the medulla is located deeper within the ovary. 3. Ovarian cortex (Choice C) is the outer layer of the ovary where follicles develop, while the medulla is the inner region. In summary, the correct answer is D (Ovarian medulla) as it accurately identifies the inner region of the ovary where blood vessels and connective tissue are located, distinguishing it from the other choices.

Correct Answer: D

Rationale: The correct answer is D: Ovaries. Female gonads are responsible for producing eggs and releasing hormones like estrogen and progesterone. The other choices, A: Testes, are male gonads responsible for producing sperm. B: Vagina is a part of the female reproductive system but not a gonad. C: Cervix is a part of the female reproductive system that connects the uterus to the vagina, but it is not a gonad. Therefore, the correct answer is ovaries as they are the female gonads responsible for egg production and hormone secretion.

Correct Answer: B

Rationale: The correct answer is B: Uterus. The uterus is a muscular organ located between the bladder and rectum. It plays a crucial role in pregnancy by nurturing and supporting the developing fetus. The other choices (A: Vagina, C: Vulva, D: Ovary) are incorrect because the vagina is a canal leading to the uterus, the vulva is the external genitalia, and the ovary is responsible for producing eggs and hormones. Therefore, the correct answer is the uterus based on its anatomical location and function in the reproductive system.