Nokea
About the external male genital organ, we can state the following:
- A. it is part of the urinary ducts, being a urination organ;
- B. it is represented by the urethra;
- C. it is a pair organ;
- D. it is located above the scrotum, anterior to the pubian symphisis;
Correct Answer: B
Rationale: Step-by-step rationale for why answer B is correct:
1. The external male genital organ is represented by the urethra, which is the duct that carries urine from the bladder out of the body.
2. The urethra is responsible for both urination and ejaculation.
3. The other choices are incorrect because the external male genital organ is not part of the urinary ducts, not a pair organ, and not located above the scrotum.
You may also like to solve these questions
Which structure contains lysosomal-like enzymes?
- A. Sertoli cells
- B. sperm head
- C. acrosome
- D. sperm tail
Correct Answer: C
Rationale: The correct answer is C: acrosome. Lysosomal-like enzymes are found in the acrosome of sperm cells, where they help in breaking down the outer layers of the egg during fertilization. Sertoli cells (A) provide nourishment and support for developing sperm cells. The sperm head (B) contains genetic material but not lysosomal-like enzymes. The sperm tail (D) is responsible for movement and does not contain lysosomal-like enzymes. Therefore, the acrosome (C) is the structure that specifically houses these enzymes for the fertilization process.
Which of the following portions of the placenta secretes HCG?
- A. Syncytiotrophoblast
- B. Cytotrophoblast
- C. Endometrium
- D. Chorion
Correct Answer: A
Rationale: The correct answer is A: Syncytiotrophoblast. This layer of the placenta secretes human chorionic gonadotropin (HCG), a hormone crucial for maintaining pregnancy by supporting the corpus luteum to produce progesterone. Syncytiotrophoblast is a multinucleated layer formed from the fusion of cytotrophoblast cells and is responsible for hormone secretion.
B: Cytotrophoblast is the inner layer of the trophoblast but does not secrete HCG.
C: Endometrium is the lining of the uterus and is not part of the placenta.
D: Chorion is a membrane that contributes to the formation of the placenta but does not secrete HCG.
A thin single flat bone that forms the lower portion of the nasal septum is
- A. Lacrimal bones
- B. Nasal bones
- C. Inferior nasal choncha
- D. Vomer
Correct Answer: D
Rationale: The correct answer is D: Vomer. The vomer is a thin, single flat bone that forms the lower portion of the nasal septum. It articulates with the sphenoid, ethmoid, and maxillary bones. The lacrimal bones (A) are small bones forming part of the eye socket. Nasal bones (B) are two small bones that form the bridge of the nose. The inferior nasal concha (C) is a separate bone located in the nasal cavity, not part of the nasal septum. Therefore, the vomer is the correct answer as it specifically fits the description given in the question.
Identify the CORRECT strategy to achieve external fertilization.
- A. Female organism will modify its body parts to receive male gametes.
- B. Fertilization must occur at night to avoid predators.
- C. Eggs and sperm must be shed simultaneously into water.
- D. The release of eggs is more frequent than the release of sperm.
Correct Answer: C
Rationale: The correct strategy for external fertilization is to have eggs and sperm shed simultaneously into water. This allows the gametes to meet and fertilize outside of the organism's body. This method is effective in aquatic environments where the chances of gametes coming into contact are increased. Choice A is incorrect as it describes internal fertilization. Choice B is irrelevant to the process of external fertilization. Choice D is incorrect as the frequency of egg and sperm release does not determine the success of external fertilization.
The child's sex is determined by:
- A. the type of the spermatozoon that fecundates the ovule;
- B. the type of the fecundated ovule;
- C. the sex chromosome of the ovule;
- D. the sex chromosome of the spermatozoon
Correct Answer: D
Rationale: The correct answer is D because the sex of the child is determined by the sex chromosome carried by the spermatozoon that fertilizes the ovule. Sperm carries either an X or a Y chromosome, determining if the child will be male (XY) or female (XX). Choices A and B are incorrect because the type of spermatozoon or ovule does not solely determine the child's sex. Choice C is incorrect as well because the sex chromosome of the ovule alone does not determine the child's sex.