What is the source and function of HCG?

Correct Answer: D

Rationale: The correct answer is D: placenta; mimics LH. Rationale: 1. HCG (Human Chorionic Gonadotropin) is produced by the placenta during pregnancy. 2. HCG mimics the action of LH (Luteinizing Hormone) to support the corpus luteum in producing progesterone. 3. This helps maintain the uterine lining and supports the pregnancy. Summary: A: Incorrect - Uterus does not produce HCG, and it does not cause labor. B: Incorrect - Ovary does not produce HCG, and it does not stimulate FSH. C: Incorrect - Placenta produces HCG, but it does not inhibit LH; instead, it mimics LH's actions.

Correct Answer: D

Rationale: The correct answer is D: Penis. The penis is composed of three cylindrical masses of erectile tissue (two corpora cavernosa and one corpus spongiosum) surrounded by fibrous tissue. The corpora cavernosa fill with blood during an erection, leading to rigidity. The other choices (A: Testes, B: Prostate, C: Bladder) do not fit the description of being composed of three cylindrical masses of erectile tissue surrounded by fibrous tissue. The testes are responsible for sperm production, the prostate is a gland that produces semen, and the bladder is a hollow muscular organ for storing urine.

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: C

Rationale: The correct answer is C: Cough. Sexually transmitted diseases (STDs) are transmitted through sexual activity, not through coughing. Syphilis (A), Gonorrhea (B), and Genital Warts (D) are all STDs that are transmitted through sexual contact. Cough (C) is not a sexually transmitted disease as it is typically spread through respiratory droplets. Therefore, C is the correct answer as it does not fit the criteria of being an STD.

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.