Biology Human Reproductive System

Biology Human Reproductive System Related

Review Biology Human Reproductive System related questions and content

Which factor causes the act of ovulation?

  • A. blood pressure
  • B. LH levels
  • C. FSH levels
  • D. estrogen
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

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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.

Cowper's gland is another name for:

  • A. Prostate gland
  • B. Testes
  • C. Bulbourethral glands
  • D. Preputial glands
Correct Answer: C

Rationale: The correct answer is C: Bulbourethral glands. Cowper's gland is another name for the bulbourethral glands, which are responsible for producing a lubricating fluid that helps neutralize acidity in the urethra before ejaculation. The prostate gland (A) is responsible for producing seminal fluid, the testes (B) are responsible for producing sperm, and the preputial glands (D) are glands found in the foreskin of the penis. Therefore, the bulbourethral glands (C) are the correct answer because they align with the function and location of Cowper's gland.

The external male genital organ displays:

  • A. a corpus spongiosum that surrounds the urethra;
  • B. numerous blood vessels;
  • C. two corpora cavernosa;
  • D. root, attached to the pelvis bones;
Correct Answer: A

Rationale: Step-by-step rationale:
1. The corpus spongiosum surrounds the urethra in the male external genital organ, aiding in the passage of urine and semen.
2. This structure is crucial for maintaining proper urinary and reproductive functions.
3. The other choices are incorrect because:
- Choice B is vague and does not specifically relate to the male genital organ.
- Choice C refers to the corpora cavernosa, which are erectile tissue in the penis, not the urethra.
- Choice D describes the root of the penis but does not specifically relate to the corpus spongiosum.

Haversian canals are seen in

  • A. Cortical bone
  • B. Cancellous bone
  • C. Spongy bone
  • D. N/A
Correct Answer: A

Rationale: The correct answer is A: Cortical bone. Haversian canals are found in cortical bone, which is the dense outer layer of bone tissue. These canals contain blood vessels, nerves, and lymphatics, allowing for the exchange of nutrients and waste products. Cancellous bone (B) is spongy bone with a network of trabeculae and does not contain Haversian canals. Spongy bone (C) is a type of bone tissue with a porous structure but lacks the organized Haversian system seen in cortical bone. "N/A" (D) is not a valid option as it does not provide any relevant information.

__________ 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.

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