The ducts or tubes responsible for receiving the ovulated oocyte and providing the site for fertilization are the ________.

Correct Answer: A

Rationale: The correct answer is A: uterine (fallopian) tubes. These tubes receive the ovulated oocyte from the ovary and provide the site for fertilization. The other choices are incorrect because: B: The vagina is the birth canal and site for sperm deposition, not fertilization. C: The ductus deferens is part of the male reproductive system, not involved in fertilization. D: The uterus is where the fertilized egg implants and develops into a fetus, it is not the site for fertilization.

Correct Answer: D

Rationale: The correct answer is D: LH triggers ovulation in a female. LH is a hormone released by the pituitary gland that stimulates the release of an egg from the ovary during the menstrual cycle. This process is known as ovulation. It is a crucial step in the reproductive cycle of females. A: LH does not promote the enlargement of female breasts. Breast growth is primarily regulated by estrogen and progesterone. B: LH does have a significant effect on females, particularly in the reproductive system. C: While LH does contribute to the development of secondary sex characteristics in females, its main role is in triggering ovulation.

Correct Answer: B

Rationale: The correct answer is B: oxytocin. Braxton Hicks contractions are irregular, painless contractions of the uterus that occur throughout pregnancy. Oxytocin is the hormone responsible for stimulating contractions during labor. Therefore, the presence of Braxton Hicks contractions indicates the preparation of the uterus for labor under the influence of oxytocin. Choices A, C, and D are incorrect as they do not directly relate to the physiological mechanism of Braxton Hicks contractions.

Correct Answer: D

Rationale: Step-by-step rationale for why the correct answer is D: 1. Testes are the male gonads responsible for producing sperm. 2. The testes function as the primary reproductive organ in males. 3. Sperm production occurs in the seminiferous tubules within the testes. 4. The testes also produce testosterone, the primary male sex hormone. Summary of why other choices are incorrect: A: Producing - While testes do produce sperm, this choice lacks specificity regarding the male gonads. B: Estrogen functions and are called ________ - Estrogen is a female sex hormone, not produced by male gonads. C: Progesterone - Progesterone is a female sex hormone produced mainly by the ovaries, not by male gonads.

Correct Answer: D

Rationale: The correct answer is D: 14 days. During oogenesis, the process of ovulation occurs approximately 14 days prior to the start of the next menstrual cycle. This is crucial for timing fertilization and pregnancy. The other choices are incorrect because: A: an ovum is the mature egg released during ovulation, not directly related to the menstrual cycle. B: 7 days is not a relevant timeframe in the context of oogenesis and menstrual cycles. C: a primary oocyte is the initial stage of egg development and needs further maturation before ovulation, not directly linked to the menstrual cycle timing.