Nokea
Hair like process on the sperm cell that makes it motile or moveable is
- A. Cilia
- B. Flagella
- C. Pseudopodia
- D. Dendritic processes
Correct Answer: B
Rationale: The correct answer is B: Flagella. Flagella are whip-like structures that provide motility to sperm cells. They enable the sperm cell to move towards the egg for fertilization. Cilia (choice A) are shorter hair-like structures involved in movement but are not found on sperm cells. Pseudopodia (choice C) are temporary projections used for cell movement in some organisms, not sperm cells. Dendritic processes (choice D) refer to branching extensions of nerve cells, not involved in sperm motility. Therefore, flagella is the most appropriate choice for the hair-like process on the sperm cell that makes it motile.
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Ectoderm, mesoderm, and endoderm are three tissue layers that are formed during _____________ stage.
- A. morula
- B. blastula
- C. gastrula
- D. neurula
Correct Answer: C
Rationale: The correct answer is C: gastrula. During the gastrula stage of embryonic development, the blastula undergoes a process called gastrulation, where the three primary germ layers - ectoderm, mesoderm, and endoderm - are formed. The ectoderm gives rise to the nervous system and skin, the mesoderm forms muscles and organs, and the endoderm develops into the lining of the digestive tract and respiratory system. Morula (A) is an earlier stage where the zygote divides into multiple cells. Blastula (B) is the stage before gastrula where a hollow ball of cells is formed. Neurula (D) is a stage specific to vertebrate embryos where the neural tube begins to form.
A major function of FSH is to
- A. stimulate the development of the gonads during early development.
- B. stimulate spermatogenesis in males and oocytes maturation in females.
- C. increase the secretion of testosterone by the testes.
- D. regulate the secretion of the bulbourethral gland
Correct Answer: B
Rationale: The correct answer is B because FSH, or Follicle-Stimulating Hormone, stimulates spermatogenesis in males and oocyte maturation in females. In males, FSH acts on the Sertoli cells in the testes to promote the development of sperm cells. In females, FSH stimulates the growth and maturation of ovarian follicles, leading to the release of mature eggs.
Choice A is incorrect because FSH is not primarily responsible for the development of gonads during early development. Choice C is incorrect because FSH does not directly increase the secretion of testosterone by the testes; that is the role of LH (Luteinizing Hormone). Choice D is incorrect because FSH does not regulate the secretion of the bulbourethral gland; that is controlled by other hormones.
Of the two functional areas of the years of age is known as ________. It blastocyst, the three primary germ is during this time that the reproductive layers form from the ________. organs grow to their adult size and
- A. amnion become functional under the influence
- B. morula of hormones.
- C. inner cell mass
- D. adulthood
Correct Answer: D
Rationale: The correct answer is D: adulthood. The question is referring to the two functional areas of life - childhood and adulthood. During adulthood, organs grow to their adult size and mature, reproductive organs become functional under the influence of hormones.
A: amnion become functional under the influence - Incorrect. Amnion is a membrane surrounding the embryo, not related to the functional areas of age.
B: morula of hormones - Incorrect. Morula is an early stage of embryonic development, not related to the functional areas of age.
C: inner cell mass - Incorrect. Inner cell mass is a part of the blastocyst, not related to the functional areas of age.
The end of the vas deferens is a dilated sac called the _____.
- A. ductus deferens
- B. seminal vesicle
- C. ampulla
- D. ejaculatory duct
Correct Answer: C
Rationale: The correct answer is C: ampulla. The ampulla is a dilated portion at the end of the vas deferens where it joins with the duct of the seminal vesicle to form the ejaculatory duct. This structure serves as a storage and mixing area for sperm and seminal fluid before ejaculation. The other choices, A: ductus deferens, is another name for the vas deferens itself; B: seminal vesicle is a gland that produces seminal fluid but is not the dilated sac at the end of the vas deferens; D: ejaculatory duct is formed by the union of the vas deferens and the duct of the seminal vesicle, it is not the dilated sac itself.
A nurse goes to a high school to teach students about reducing the risk of sexually transmitted infections. Which of the following is the best answer for providing information on the prevention of STIs?
- A. Have monogamous sex with an infected partner.
- B. Abstain from sexual activities.
- C. Wash any areas where there has been indirect contact with semen or vaginal mucus.
- D. Avoid protected sex until you and sexual partners have completed treatment.
Correct Answer: B
Rationale: Abstinence is the most effective way to prevent STIs.