An embryo is known as a fetus during parturition? by the ________ week of pregnancy.

Correct Answer: C

Rationale: The correct answer is C: second. An embryo is known as a fetus during parturition by the second week of pregnancy. This is because by the end of the eighth week of gestation, the embryo has developed all major organs and structures, transitioning to the fetal stage. Choice A is incorrect because oxytocin increases during labor, not by the second week of pregnancy. Choice B is incorrect as the first contractions of the uterus occur during labor, not during the second week of pregnancy. Choice D is incorrect as oxytocin actually promotes uterine contractions during labor.

Correct Answer: D

Rationale: Rationale: 1. Leydig cells are located in the testes and are responsible for secreting testosterone. 2. Testosterone is a male sex hormone crucial for the development of male reproductive tissues. 3. Spermatocytes and oocytes are involved in gamete production, not testosterone secretion. 4. Anterior pituitary cells secrete hormones like FSH and LH, not testosterone. Summary: Leydig cells secrete testosterone in the testes, making them the correct choice. Spermatocytes, oocytes, and anterior pituitary cells are not involved in testosterone secretion.

Correct Answer: A

Rationale: The correct answer is A: Breast. The mammary glands, also known as breasts, are located at the chest level and produce milk for the newborn baby. This is a basic anatomical fact. B: Ovary is incorrect as ovaries are reproductive organs in females that produce eggs, not milk. C: Cervix is incorrect as it is a part of the female reproductive system that connects the vagina to the uterus, not involved in milk production. D: Zygote is incorrect as it is the initial cell formed from the fusion of sperm and egg during fertilization, not related to milk production.

Correct Answer: B

Rationale: The correct answer is B: neonatal. "Neo-" means new or recent, and "-natal" refers to birth. Therefore, neonatal means pertaining to new birth. Choice A, antenatal, refers to the period before birth. Choice C, neonate, refers to a newborn baby. Choice D, newborn, simply means a recently born baby without specifying the time frame as "neonatal" does.

Correct Answer: B

Rationale: Step 1: The epididymal duct is a coiled tube located on the posterior surface of the testis. Step 2: It continues as the deferent duct (vas deferens) which is responsible for transporting sperm from the epididymis to the ejaculatory duct. Step 3: Therefore, choice B is correct as the epididymal duct indeed continues as the deferent duct. Summary: A: Incorrect - The epididymal duct is not located within the testis. C: Incorrect - The testicular efferent ducts are separate from the epididymal duct. D: Incorrect - The epididymal duct is considered part of the male reproductive system within the scrotum, not outside it.