If bone is splintered or crushed in several places it is termed as

Correct Answer: D

Rationale: The correct answer is D: Comminuted fracture. This type of fracture occurs when the bone is splintered or crushed in several places, leading to multiple bone fragments. This term accurately describes the situation where the bone is broken into multiple pieces. A: Complex fracture refers to a fracture that involves multiple breaks in a bone, but not necessarily into multiple small fragments. B: Greenstick fracture is an incomplete fracture where the bone is bent but not completely broken. C: Impacted fracture occurs when the broken ends of the bone are driven into each other, typically seen in a fall with a lot of force, but it does not involve multiple bone fragments like in a comminuted fracture.

Correct Answer: C

Rationale: The correct answer is C because the external female reproductive organs typically include the vaginal opening, the labia majora, and the clitoris. The vaginal opening is where sperm enters and a baby exits during childbirth. The labia majora are the outer folds of skin that protect the vaginal and urethral openings. The clitoris is a highly sensitive sexual organ that plays a key role in sexual pleasure. Option A is incorrect because it includes the mons pubis, which is not considered an external reproductive organ. Option B is incorrect because it includes the hymen, which is a thin membrane that may partially cover the vaginal opening but is not a consistent external organ. Option D is incorrect because it includes the ovaries, which are internal organs responsible for producing eggs, not external reproductive organs.

Correct Answer: D

Rationale: The correct answer is D: primary spermatocyte. Primary spermatocytes are the cells in the seminiferous tubules that progress through the first meiotic division. During this division, primary spermatocytes undergo DNA replication and then divide into two secondary spermatocytes. These secondary spermatocytes will then undergo the second meiotic division to produce haploid spermatids. Explanation for why other choices are incorrect: A: Sertoli cells are supporting cells in the seminiferous tubules but do not undergo meiotic divisions. B: Spermatogonia are the undifferentiated germ cells that give rise to primary spermatocytes but do not progress through meiotic divisions. C: Spermatids are the haploid cells produced after the two meiotic divisions, so they do not progress through the first meiotic division. In summary, primary spermatocytes are the cells that go through the first meiotic division in the seminiferous tubules

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.

Correct Answer: C

Rationale: The correct answer is C because prostaglandin E2 plays a key role in initiating labor by promoting uterine contractions. Administering an antagonist of prostaglandin E2 effects would inhibit this process. Choice A is incorrect as progesterone levels decrease to trigger labor. Choice B is incorrect as luteinizing hormone does not directly influence labor initiation. Choice D is incorrect because mechanical dilation does not inhibit labor initiation but rather can facilitate it.