The external male genital organ displays:

Correct Answer: A

Rationale: Step-by-step rationale: 1. The corpus spongiosum surrounds the urethra in the male external genital organ, aiding in the passage of urine and semen. 2. This structure is crucial for maintaining proper urinary and reproductive functions. 3. The other choices are incorrect because: - Choice B is vague and does not specifically relate to the male genital organ. - Choice C refers to the corpora cavernosa, which are erectile tissue in the penis, not the urethra. - Choice D describes the root of the penis but does not specifically relate to the corpus spongiosum.

Correct Answer: C

Rationale: The correct answer is C: the release of an oocyte. During the menstrual cycle, ovulation occurs where a mature egg (oocyte) is released from the ovary. This typically happens around the middle of the cycle in response to hormonal changes. This process is essential for fertilization and pregnancy to occur. A, B, and D are incorrect because: A: the maturation of a single secondary ovarian follicle - This occurs before ovulation, not during the menstrual cycle. B: the transformation of a primordial follicle into a secondary one - This is an earlier stage in follicle development, not a monthly occurrence. D: the release of a de Graaf follicle - The Graafian follicle is the mature follicle that releases the oocyte during ovulation, not a monthly event.

Correct Answer: C

Rationale: Step 1: The uterine cavity displays a mucous membrane that undergoes cyclical modifications due to hormonal changes during the menstrual cycle. Step 2: This mucous membrane is essential for embryo implantation and plays a crucial role in pregnancy. Step 3: The cyclical modifications of the mucous membrane are necessary for the shedding of the endometrium during menstruation. Summary: Choice C is correct because it accurately describes a key function of the uterus related to the menstrual cycle. Choices A, B, and D are incorrect as they do not address the specific function of the uterine cavity and its mucous membrane modifications.

Correct Answer: B

Rationale: The correct answer is B: 23 autosomes. The ovule contains half the number of chromosomes as the typical somatic cell, which is 46 in humans. This is because during meiosis, the number of chromosomes is reduced by half to ensure the correct chromosome number in the offspring. Therefore, the ovule contains 23 chromosomes, which are autosomes (non-sex chromosomes). Choices A, C, and D are incorrect because the ovule does not contain the same number of somatic chromosomes, a sex chromosome, or 11 pairs of somatic chromosomes.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.