Reversal of sterilization procedures in males is done by which of the following procedures?

Correct Answer: C

Rationale: The correct answer is C: Vasovasostomy. This procedure involves reconnecting the vas deferens to reverse a vasectomy, allowing sperm to be present in the ejaculate again. Orchiopexy (A) is the surgical fixation of a testicle in the scrotum and is not related to reversing sterilization. Vasectomy (B) is the sterilization procedure itself, not the reversal. Bilateral orchiectomy (D) is the surgical removal of both testicles and is a permanent sterilization method, not a reversal procedure. Therefore, the correct choice is C as it directly addresses the reversal of male sterilization.

Correct Answer: D

Rationale: The correct answer is D: Scapula. The scapula is commonly known as the shoulder blade and is the bone that connects the upper arm bone (humerus) to the collarbone (clavicle) to form the shoulder joint. The other choices, A: Clavicle, is the collarbone; B: Sternum, is the breastbone; and C: Humerus, is the upper arm bone, are not specifically referred to as the shoulder bone. Therefore, the scapula is the correct answer as it is directly associated with the shoulder joint.

Correct Answer: B

Rationale: The correct answer is B: Sternum. The sternum is commonly referred to as the breastbone because it is a flat bone located in the center of the chest. It connects to the rib cage and helps protect vital organs such as the heart and lungs. The xiphoid process (choice A) is the lower part of the sternum, the clavicle (choice C) is the collarbone, and the coracoid process (choice D) is a projection on the scapula. Therefore, the sternum is the most appropriate term for the breastbone.

Correct Answer: A

Rationale: The correct answer is A: Lumbar vertebrae. The lumbar vertebrae are the largest and strongest of the vertebral column due to their weight-bearing function in supporting the upper body. They have a larger body and thicker structures compared to other vertebrae, providing stability and support. The sacrum, thoracic, and cervical vertebrae are not as large or strong as the lumbar vertebrae, as they have different functions and shapes tailored to their specific roles in the spine.

Correct Answer: D

Rationale: The correct answer is D: epididymis. After being produced in the testes, sperm move into the epididymis for maturation. The epididymis provides the optimal environment for sperm storage and maturation, allowing them to gain motility and fertilization capability. The seminiferous tubes (A) are where sperm are produced, not matured. The penis (B) is the external organ for ejaculation, not maturation. The vas deferens (C) is the tube that carries mature sperm from the epididymis to the urethra, not the site of sperm maturation.