Which part of the uterus opens into the vagina?

Correct Answer: B

Rationale: The correct answer is B: Cervix. The cervix is the lower part of the uterus that opens into the vagina. It acts as a barrier between the uterus and vagina, and allows for the passage of menstrual flow, sperm, and a baby during childbirth. The other choices are incorrect because the urethra is a tube that connects the bladder to the outside of the body, the uterine tubes are also known as fallopian tubes that connect the ovaries to the uterus, and the inguinal canal is a passage in the abdominal wall.

Correct Answer: C

Rationale: The correct answer is C: Puberty. Puberty is the stage of development when gametes are produced and secondary sex characteristics appear, marking the beginning of the fertile period. This period typically occurs between the ages of 10 to 14 in females and 12 to 16 in males. A: Teenage - Incorrect. Teenage refers to the age range between 13 to 19 and does not specifically indicate the onset of gamete production and secondary sex characteristics. B: Adolescence - Incorrect. Adolescence is a broader term that encompasses the period from childhood to adulthood, including puberty, but it does not specifically indicate the beginning of the fertile period. D: Juvenile - Incorrect. Juvenile refers to a young organism that has not reached sexual maturity and does not signify the beginning of gamete production and secondary sex characteristics.

Correct Answer: C

Rationale: The correct answer is C: Perimetrium. The perimetrium is the outermost layer of the uterus and consists of a thin serous layer of connective tissue. This layer provides support and protection to the uterus. Rationale: 1. Peritoneum (A) is the serous membrane that lines the abdominal cavity, not the outermost layer of the uterus. 2. Pericardium (B) is the membranous sac that surrounds the heart, not related to the uterus. 3. Pericyte (D) is a type of cell found in blood vessels and involved in vascular function, not a layer of the uterus. In summary, the perimetrium is the correct answer as it is the specific layer that forms the outer covering of the uterus, providing structural support and protection.

Correct Answer: B

Rationale: The correct answer is B: Gynecomastia. Gynecomastia refers to the abnormal enlargement of male breast tissue, which can be unilateral or bilateral. This condition is commonly caused by hormonal imbalances, medication side effects, or underlying medical conditions. Mastodynia (A) refers to breast pain, Mammocele (C) is a term for a breast cyst, and Teratoma (D) is a type of tumor that contains multiple types of tissue. Therefore, the correct term for male breast enlargement is gynecomastia.

Correct Answer: D

Rationale: The correct answer is D: Testicular torsion. Testicular torsion occurs when the spermatic cord twists, cutting off blood flow to the testicle. This can lead to severe pain and require emergency treatment to prevent tissue damage. Varicocele (A) is the enlargement of veins within the scrotum. Hydrocele (B) is the accumulation of fluid around the testicle. Cryptorchidism (C) is the condition of undescended testicles. Testicular torsion is the only choice that directly involves twisting of the spermatic cord leading to a medical emergency.