Nokea
Where does the epididymis direct sperm cells into?
- A. vas efferens
- B. vas deferens
- C. rete testis
- D. prostate gland
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.
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Which of the following is suitable for the fertilization of an egg?
- A. Sperm
- B. Spermatid
- C. Primary spermatocyte
- D. Spermatogonium
Correct Answer: A
Rationale: The correct answer is A: Sperm. Sperm is the mature male reproductive cell capable of fertilizing an egg. It carries genetic material and is designed for the process of fertilization. Spermatid (B) is an immature sperm cell not yet capable of fertilizing an egg. Primary spermatocyte (C) is a cell undergoing meiosis to produce spermatids. Spermatogonium (D) is a stem cell that gives rise to spermatocytes but is not directly involved in fertilization. Therefore, only sperm (A) is suitable for fertilizing an egg.
Which structure is composed of three cylindrical masses of erectile tissue each surrounded by a fibrous tissue?
- A. Testes
- B. Prostate
- C. Bladder
- D. Penis
Correct Answer: D
Rationale: The correct answer is D: Penis. The penis is composed of three cylindrical masses of erectile tissue (two corpora cavernosa and one corpus spongiosum) surrounded by fibrous tissue. The corpora cavernosa fill with blood during an erection, leading to rigidity. The other choices (A: Testes, B: Prostate, C: Bladder) do not fit the description of being composed of three cylindrical masses of erectile tissue surrounded by fibrous tissue. The testes are responsible for sperm production, the prostate is a gland that produces semen, and the bladder is a hollow muscular organ for storing urine.
Infants of mothers who had adequate nutrition during pregnancy do not require iron supplements or a diet rich in iron until about 3 months of age. Why is this?
- A. Growth of the infant does not require iron until after the 3rd month
- B. The fetal liver stores enough iron to meet the infant’s needs until the third month
- C. Synthesis of new red blood cells begins after 3 months
- D. Muscle cells that develop before the 3rd month do not contain myoglobin
Correct Answer: B
Rationale: The correct answer is B: The fetal liver stores enough iron to meet the infant’s needs until the third month. During pregnancy, the fetus accumulates iron stores in the liver from the mother, which can sustain the infant's iron needs for the first few months of life. This stored iron is gradually utilized by the infant as the maternal iron supply diminishes post-birth.
Explanation of why the other choices are incorrect:
A: Growth of the infant does require iron even in the early months for various metabolic processes and functions.
C: Synthesis of new red blood cells starts shortly after birth, not necessarily after 3 months.
D: Myoglobin is not directly related to iron supplementation needs in infants and is unrelated to the timing of iron supplementation requirements.
Failure of the testes to descend into mitotic cell divisions occur as the the scrotum is a condition known as zygote travels down the uterine ________.
- A. phimosis
- B. the acrosomal reaction
- C. cryptorchidism
- D. cleavage
Correct Answer: C
Rationale: The correct answer is C: cryptorchidism. Cryptorchidism is the condition where one or both testes fail to descend into the scrotum. This leads to impaired spermatogenesis as the temperature in the abdominal cavity is too high for proper sperm production. Phimosis (A) is the narrowing of the opening of the foreskin, unrelated to testicular descent. The acrosomal reaction (B) is a process during fertilization, not related to testicular descent. Cleavage (D) refers to the rapid mitotic cell divisions of the zygote, not associated with testicular descent.
__________ is an example of an oviparous animal.
- A. Pigeon
- B. Elephant
- C. Sheep
- D. None of the above
Correct Answer: A
Rationale: The correct answer is A: Pigeon. Oviparous animals lay eggs to reproduce, like birds. Pigeons belong to the avian class, known for laying eggs. Elephants and sheep are viviparous mammals, giving birth to live young. "None of the above" is incorrect as pigeons are indeed oviparous.