What does line “G” point to?

Correct Answer: B

Rationale: The correct answer is B: Cremaster muscle. Line "G" points to the cremaster muscle because it is the muscle responsible for raising and lowering the testes to regulate their temperature. This muscle is located within the spermatic cord and is crucial for maintaining optimal conditions for sperm production. The other choices are incorrect because: A: The dartos muscle is responsible for wrinkling the scrotal skin but is not depicted by line "G." C: Fascia refers to connective tissue and does not match the description of the muscle shown by line "G." D: The tunica albuginea is a fibrous coat around the testis but is not represented by line "G."

Correct Answer: A

Rationale: The correct answer is A: Chlamydia. Nongonococcal urethritis is primarily caused by Chlamydia trachomatis, a common sexually transmitted infection. Chlamydia is a major cause of urethritis in men. Gonorrhea (choice B) is another sexually transmitted infection but is not classified as nongonococcal urethritis. Herpes (choice C) and Syphilis (choice D) are caused by different pathogens and present with distinct symptoms, not typically associated with urethritis. Therefore, Chlamydia is the correct choice for Nongonococcal urethritis.

Correct Answer: C

Rationale: The correct answer is C: Bulbourethral glands. Cowper's gland is another name for the bulbourethral glands, which are responsible for producing a lubricating fluid that helps neutralize acidity in the urethra before ejaculation. The prostate gland (A) is responsible for producing seminal fluid, the testes (B) are responsible for producing sperm, and the preputial glands (D) are glands found in the foreskin of the penis. Therefore, the bulbourethral glands (C) are the correct answer because they align with the function and location of Cowper's gland.

Correct Answer: B

Rationale: The correct answer is B: Seminiferous tubules. These are the structures within the testes where sperm production occurs. This is the main function of testicular parenchymal tissue. Interstitial cells of Leydig (A) produce testosterone, spermatozoon (C) is a mature sperm cell, and semen (D) is a fluid that contains sperm and other substances. These choices are incorrect as they do not specifically represent the parenchymal tissue of the testes where sperm production takes place.

Correct Answer: B

Rationale: The correct answer is B: Vitamin D. Vitamin D is essential for bone formation as it helps the body absorb calcium, a key mineral for bone health. Without sufficient vitamin D, the body cannot effectively utilize calcium, leading to weakened bones. Vitamin A (Choice A) is important for vision and immune function, not specifically bone formation. Vitamin C (Choice C) is crucial for collagen synthesis but not directly involved in bone formation. Vitamin K (Choice D) plays a role in blood clotting and bone mineralization but is not as directly linked to bone formation as Vitamin D.