Nokea
Also called the mammary gland, two of these are located at the chest level and produce milk for the newborn baby.
- A. Breast
- B. Ovary
- C. Cervix
- D. zygote
Correct Answer: A
Rationale: The correct answer is A: Breast. The mammary glands, also known as breasts, are located at the chest level and produce milk for the newborn baby. This is a basic anatomical fact.
B: Ovary is incorrect as ovaries are reproductive organs in females that produce eggs, not milk.
C: Cervix is incorrect as it is a part of the female reproductive system that connects the vagina to the uterus, not involved in milk production.
D: Zygote is incorrect as it is the initial cell formed from the fusion of sperm and egg during fertilization, not related to milk production.
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Which gland provides fructose, a sugar in semen that energizes sperm?
- A. Seminal vesicles
- B. Bulbourethral gland
- C. Prostate
- D. Epididymis
Correct Answer: A
Rationale: The correct answer is A: Seminal vesicles. These glands produce fructose, a sugar in semen that provides energy for sperm. Seminal vesicles are located near the base of the bladder and are responsible for producing a significant portion of the fluid in semen. The other choices are incorrect because the bulbourethral gland produces a clear lubricating fluid, the prostate produces a milky fluid that helps with sperm motility and viability, and the epididymis is a coiled tube where sperm mature and are stored, but it does not produce fructose.
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.
Where are sperm produced within a male's testis?
- A. Seminiferous tubules
- B. Ejaculatory duct
- C. Interstitial cells
- D. Rete testis
Correct Answer: A
Rationale: The correct answer is A: Seminiferous tubules. Sperm production occurs in the seminiferous tubules of the testis through a process called spermatogenesis. This is where germ cells develop into mature spermatozoa. The other choices are incorrect: B: Ejaculatory duct is where sperm and seminal fluid mix before ejaculation, C: Interstitial cells produce testosterone, and D: Rete testis is a network of tubules where sperm travel after being produced in the seminiferous tubules.
Which of the following is produced by the trophoblast cells during the first 3 weeks of pregnancy?
- A. Estrogen
- B. Luteinizing hormone
- C. Oxytocin
- D. Human chorionic gonadotropin
Correct Answer: D
Rationale: The correct answer is D: Human chorionic gonadotropin (hCG). During the first 3 weeks of pregnancy, trophoblast cells produce hCG, which is crucial for maintaining the corpus luteum and ensuring the production of progesterone to support the early pregnancy. hCG is also the hormone detected in pregnancy tests.
Rationale:
A: Estrogen is mainly produced by the ovaries, not trophoblast cells in the early stages of pregnancy.
B: Luteinizing hormone is produced by the pituitary gland to trigger ovulation, not by trophoblast cells.
C: Oxytocin is produced by the hypothalamus and released by the pituitary gland during labor and breastfeeding, not by trophoblast cells in the early stages of pregnancy.
Giving prostaglandin E2 (PGE2) to a pregnant woman may result in an abortion. What is the best explanation for this finding?
- A. PGE2 strongly stimulates uterine contraction
- B. PGE2 causes constriction of the arteries leading to the placenta
- C. PGE2 stimulates the release of oxytocin from the posterior pituitary
- D. PGE2 increases the secretion of progesterone from the corpus luteum
Correct Answer: A
Rationale: The correct answer is A because prostaglandin E2 (PGE2) is known to strongly stimulate uterine contractions. This can lead to abortion by triggering premature labor and causing the expulsion of the fetus. Choice B is incorrect as PGE2 does not cause arterial constriction leading to the placenta. Choice C is incorrect because PGE2 does not stimulate the release of oxytocin; rather, oxytocin itself is a hormone that stimulates uterine contractions. Choice D is also incorrect as PGE2 does not increase progesterone secretion from the corpus luteum; in fact, PGE2 can have the opposite effect by inhibiting progesterone synthesis.