Nokea
Regarding male reproductive system
- A. Hypospodiasis is caused by the failure of urethral groove to close
- B. The connection between tunica vaginalis and abdominal cavity close after the descendant of testis
- C. SRY protein causes the Wolffian duct to regress
- D. Ampulla of fallopian tube is the commonest site for fertilization
Correct Answer: C
Rationale: The correct answer is C because the SRY protein is responsible for causing the regression of the Wolffian duct in male development. This process leads to the formation of male reproductive structures such as the vas deferens. The other choices are incorrect because:
A: Hypospadias is actually caused by the incomplete closure of the urethral groove during development.
B: The connection between the tunica vaginalis and the abdominal cavity closes after the descent of the testis, not before.
D: The ampulla of the fallopian tube is not involved in male reproduction; it is actually the site of fertilization in the female reproductive system.
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The spongy tissue of the penis fills
- A. circumcision with blood during sexual excitement
- B. spermatogenesis and causes the penis to enlarge and
- C. ejaculation become rigid during ________.
- D. erection
Correct Answer: D
Rationale: The spongy tissue of the penis fills with blood during an erection to cause the penis to become rigid. This process is essential for maintaining an erection during sexual activity. Spermatogenesis refers to the production of sperm, not the filling of spongy tissue. Circumcision does not involve the filling of spongy tissue with blood. Ejaculation is the release of semen and does not involve the filling of spongy tissue. Therefore, the correct answer is D as it accurately describes the physiological process of penile erection.
The radius, ulna and humerus forms the ___________ joint.
- A. Knee
- B. Elbow
- C. Ankle
- D. Shoulder
Correct Answer: B
Rationale: The correct answer is B: Elbow. The radius, ulna, and humerus form the elbow joint. The ulna and humerus articulate at the trochlear notch, forming the hinge joint, while the radius articulates with the humerus at the capitulum, allowing for rotation. This combination of movements allows for flexion and extension of the forearm. The other choices, knee (A), ankle (C), and shoulder (D), involve different bones and joints in the body that do not include the radius, ulna, and humerus.
Sperm production begins in the
- A. seminiferous tubules
- B. epididymis
- C. vas deferens
- D. ejaculatory duct
Correct Answer: A
Rationale: The correct answer is A: seminiferous tubules. Sperm production starts in the seminiferous tubules of the testes through a process called spermatogenesis, involving the division and maturation of germ cells. The other choices, B: epididymis, C: vas deferens, and D: ejaculatory duct, are incorrect as they are not sites of sperm production but rather play roles in sperm storage, transport, and ejaculation, respectively. The seminiferous tubules are specifically designed for sperm production, making them the correct choice in this context.
Which hormone is necessary for the growth of endometrial glands, which are important for the sustenance of a growing embryo until its implantation?
- A. Luteinizing hormone (LH)
- B. Testosterone
- C. Progesterone
- D. Inhibin
Correct Answer: C
Rationale: The correct answer is C: Progesterone. Progesterone is necessary for the growth of endometrial glands as it prepares the endometrium for implantation of the embryo. LH is responsible for ovulation, not endometrial gland growth. Testosterone is a male sex hormone and not directly involved in endometrial gland growth. Inhibin regulates FSH secretion, not endometrial gland growth.
The outside layer of the oocyte is the _____.
- A. theca interna
- B. theca externa
- C. zona pellucida
- D. antrum
Correct Answer: C
Rationale: The correct answer is C: zona pellucida. The zona pellucida is the glycoprotein layer surrounding the oocyte. It plays a crucial role in fertilization by binding sperm and facilitating the acrosome reaction. The theca interna and externa are layers surrounding the ovarian follicle, not the oocyte itself. The antrum is a fluid-filled cavity within the follicle, not the outer layer of the oocyte. Therefore, the correct choice is C as it directly relates to the outer layer of the oocyte.