The urethra passes through the _____ of the penis.

Correct Answer: C

Rationale: The correct answer is C: corpora spongiosum. The urethra passes through the corpora spongiosum of the penis, which is a spongy tissue that surrounds the urethra. This allows for the passage of urine and semen during ejaculation. The other choices are incorrect because: A) The tunica albuginea is a fibrous covering of the corpora cavernosa, not the urethra. B) The prepuce is the foreskin that covers the glans penis, not part of the urethra. D) The corpora cavernosa are erectile tissue responsible for penile erection, not part of the urethra's pathway.

Correct Answer: C

Rationale: The correct answer is C: estrogen. Estrogen is a type of steroid hormone derived from cholesterol. Steroids are a specific group of lipids characterized by a particular molecular structure. Estrogen plays a vital role in the development and regulation of the female reproductive system. Choice A, FSH, and choice B, LH, are both peptide hormones, not steroids. Peptide hormones are made up of amino acids and are not derived from cholesterol. Choice D, GnRH, is also a peptide hormone that regulates the release of other hormones in the body, particularly in the reproductive system. In summary, estrogen is the only steroid hormone among the options provided, making it the correct choice.

Correct Answer: C

Rationale: The correct answer is C: increase in calcium deposition. Menopause is associated with a decrease in estrogen levels, leading to bone loss rather than an increase in calcium deposition. Loss of hormones (A) is a result of menopause due to the decline in estrogen and progesterone. Reduction in breast mass (B) occurs as estrogen levels decrease, impacting breast tissue. Psychological changes (D) such as mood swings and irritability are common during menopause due to hormonal fluctuations. Thus, an increase in calcium deposition is not a result of menopause, making choice C the correct answer.

Correct Answer: D

Rationale: The correct answer is D: Oxygenated blood. Bidder's canal is a part of the male reproductive system and functions to transport oxygenated blood to the testicles. This is essential for maintaining the temperature required for sperm production. Eggs (A) are not transported through Bidder's canal as it is specific to male reproductive functions. Sperms (B) are produced in the testicles but are not transported through Bidder's canal. Ammonia (C) is a waste product and not involved in the circulation within the male reproductive system.

Correct Answer: D

Rationale: The correct answer is D: Ductus epididymis. The straight tubules in the testis lead into the ductus epididymis because the sperm produced in the testis pass through the straight tubules and enter the epididymis for maturation and storage. This is a crucial step in the sperm development process before they are ready for ejaculation. Rationale: - A: Efferent ducts are incorrect because they connect the rete testis to the epididymis and are responsible for transporting sperm from the testis. - B: Afferent ducts are incorrect as they carry sperm from the rete testis to the epididymis. - C: Rete testis is incorrect as it is a network of tubules where the straight tubules converge and connect to the efferent ducts, not directly to the epididymis.