Nokea
The spermatozoon is made up of:
- A. head;
- B. mid piece or neck;
- C. flagellum;
- D. body;
Correct Answer: A
Rationale: The correct answer is A: head. The spermatozoon is composed of three main parts: head, mid piece or neck, and flagellum. The head contains the nucleus which carries genetic material. The mid piece or neck contains mitochondria for energy production. The flagellum is responsible for sperm motility. In this question, the head is the most essential part of the spermatozoon as it contains the genetic material required for fertilization. The other choices (B: mid piece or neck, C: flagellum, D: body) are incorrect as they are important for sperm function but do not carry the genetic material necessary for fertilization.
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Twisting of the spermatic cord results in a condition called
- A. Varicocele
- B. Hydrocele
- C. Cryptorchidism
- D. Testicular torsion
Correct Answer: D
Rationale: The correct answer is D: Testicular torsion. Testicular torsion occurs when the spermatic cord twists, cutting off blood flow to the testicle. This can lead to severe pain and require emergency treatment to prevent tissue damage. Varicocele (A) is the enlargement of veins within the scrotum. Hydrocele (B) is the accumulation of fluid around the testicle. Cryptorchidism (C) is the condition of undescended testicles. Testicular torsion is the only choice that directly involves twisting of the spermatic cord leading to a medical emergency.
Infertility could develop when the sperm cells display _____.
- A. a count of 120 million per ml semen
- B. increased acrosomal activity
- C. normal morphology
- D. a count of less than 20 million per ml semen
Correct Answer: D
Rationale: The correct answer is D because a low sperm count (less than 20 million per ml semen) can lead to infertility as it decreases the chances of successful fertilization. A high sperm count (choice A) is actually beneficial for fertility. Increased acrosomal activity (choice B) can enhance fertilization potential. Normal morphology (choice C) refers to the shape and size of sperm, which is important for fertility but not the primary factor in infertility due to low sperm count. Overall, a low sperm count is the most significant factor in infertility.
The uterine artery vascularizes:
- A. the vagina;
- B. the Fallopian tubes;
- C. the uterus;
- D. the vulva;
Correct Answer: C
Rationale: The correct answer is C: the uterus. The uterine artery vascularizes the uterus, providing the main blood supply to this reproductive organ. This artery plays a crucial role in supplying oxygen and nutrients to the uterus, supporting the growth and development of the endometrium and the fetus during pregnancy.
Choice A, the vagina, is incorrect because the vaginal artery, not the uterine artery, supplies blood to the vagina. Choice B, the Fallopian tubes, is incorrect as they are primarily vascularized by the tubal branches of the ovarian arteries. Choice D, the vulva, is also incorrect as the blood supply to the vulva comes from multiple sources including the internal pudendal artery and the external pudendal artery, not the uterine artery.
The deferent duct (vas deferens):
- A. joins with the seminal vesicle duct and forms the ejaculatory duct;
- B. continues the rete testis;
- C. continues the epididymal duct;
- D. is an extratesticular spermatic duct;
Correct Answer: C
Rationale: Step-by-step rationale for Choice C (Continues the epididymal duct) being the correct answer:
1. The deferent duct, also known as the vas deferens, is a continuation of the epididymal duct.
2. Sperm mature and are stored in the epididymis before passing into the vas deferens.
3. The vas deferens carries sperm from the epididymis to the ejaculatory duct during ejaculation.
Summary:
- Choice A is incorrect because the deferent duct does not join with the seminal vesicle duct to form the ejaculatory duct.
- Choice B is incorrect as the vas deferens does not continue the rete testis.
- Choice D is incorrect as the vas deferens is an intratesticular spermatic duct, not extratesticular.
Which of the following sexually transmitted infections is caused by Treponema pallidum?
- A. Herpes
- B. Venereal warts
- C. Gonorrhea
- D. Syphilis
Correct Answer: D
Rationale: Syphilis is caused by the spirochete bacterium Treponema pallidum.