Nokea
Which hormone is secreted by the corpus luteum after ovulation?
- A. Progesterone
- B. Relaxin
- C. LH
- D. FSH
Correct Answer: A
Rationale: The correct answer is A: Progesterone. After ovulation, the corpus luteum forms from the ruptured follicle and secretes progesterone to prepare the uterus for implantation. Progesterone helps maintain the endometrial lining for potential pregnancy. Choice B, Relaxin, is secreted by the corpus luteum, but its main function is to soften the cervix and pubic symphysis. Choices C and D, LH and FSH respectively, are pituitary hormones involved in the menstrual cycle regulation, not directly secreted by the corpus luteum.
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Mucous membrane partially or completely covering the vaginal orifice is called as:
- A. Clitoris
- B. Labia
- C. Hymen
- D. Vulva
Correct Answer: C
Rationale: The correct answer is C: Hymen. The hymen is a mucous membrane that partially or completely covers the vaginal orifice. It is a thin tissue located at the opening of the vagina. The hymen can vary in appearance and may partially cover the vaginal opening, making it an essential anatomical structure to consider. The other choices are incorrect because:
A: Clitoris - The clitoris is a highly sensitive sexual organ located above the vaginal opening, not covering it.
B: Labia - The labia are the folds of skin surrounding the vaginal opening, not covering it entirely.
D: Vulva - The vulva refers to the external female genitalia, including the labia, clitoris, and vaginal opening, but it does not specifically refer to the mucous membrane covering the vaginal orifice.
Floating ribs of the thoracic cage are
- A. 1-7 ribs
- B. 8-10 ribs
- C. 11, 12 ribs
- D. None of the above
Correct Answer: C
Rationale: The correct answer is C: 11, 12 ribs. Floating ribs are ribs that do not have a direct attachment to the sternum. Ribs 11 and 12 are considered floating ribs because they do not attach to the sternum or cartilage of other ribs, only to the vertebrae in the back. Choices A and B are incorrect because ribs 1-10 are not considered floating ribs. Choice D is incorrect because ribs 11 and 12 are indeed the floating ribs of the thoracic cage.
Failure of the ductus arteriosus to close is a common developmental defect. Which of the following would likely be present in a 12-month-old infant with patent ductus arteriosus?
- A. Below-normal arterial PO2
- B. Below-normal arterial PCO2
- C. Greater than normal arterial blood pressure
- D. Lower than normal pulmonary arterial pressure
Correct Answer: A
Rationale: The correct answer is A: Below-normal arterial PO2. In a 12-month-old infant with patent ductus arteriosus, there would likely be a left-to-right shunt causing increased blood flow to the lungs, leading to decreased systemic blood flow. This can result in decreased systemic oxygenation and below-normal arterial PO2 levels. Choices B, C, and D are incorrect because patent ductus arteriosus does not directly affect arterial PCO2, arterial blood pressure, or pulmonary arterial pressure in a way that would lead to those specific outcomes at this age.
Which of the following hormone stimulates the development of corpus luteum?
- A. Estrogen
- B. Progesterone
- C. Luteinizing hormone (LH)
- D. Follicle stimulating hormone (FSH)
Correct Answer: C
Rationale: The correct answer is C: Luteinizing hormone (LH). LH is responsible for stimulating the development of the corpus luteum after ovulation. It triggers the release of the egg from the follicle and promotes the transformation of the follicle into the corpus luteum, which is crucial for the production of progesterone. Estrogen (A) is involved in the development of the follicle, not the corpus luteum. Progesterone (B) is produced by the corpus luteum, not responsible for its development. FSH (D) is primarily involved in stimulating the growth of ovarian follicles, not the formation of the corpus luteum.
The hormone that is released from the testes is ______.
- A. Progesterone
- B. Vasopressin
- C. Testosterone
- D. None of the above
Correct Answer: C
Rationale: The correct answer is C: Testosterone. Testosterone is the primary male sex hormone produced by the testes. It plays a crucial role in the development of male reproductive tissues and secondary sexual characteristics. Progesterone (A) is a female sex hormone produced in the ovaries, not the testes. Vasopressin (B) is a hormone produced by the pituitary gland, not the testes. "None of the above" (D) is incorrect as testosterone is indeed released from the testes.