Correct Answer: C

Rationale: The knee-chest position is the most optimal position for examining the rectum. In this position, the patient kneels on the examination table with their chest resting on it, creating a straight line from the head to the lower back. This position allows for easier access and visualization of the rectal area, making it the preferred choice for rectal examinations.

Correct Answer: B

Rationale: Before rigor mortis occurs, it is essential to place a pillow under the body's head and shoulders to maintain proper positioning. This helps prevent postmortem changes and ensures a more dignified appearance. Providing a complete bath and dressing change, removing clothing, or wrapping the body in a shroud are tasks typically done after rigor mortis sets in or later in the postmortem care process. Allowing the body to relax normally does not address the need for proper positioning before rigor mortis occurs.

Correct Answer: A

Rationale: The correct abbreviation for micro drop is 'µgtt,' where the symbol 'µ' represents micro and 'gtt' stands for drop.

Correct Answer: C

Rationale: Insulin is the hormone secreted by the Islets of Langerhans in the pancreas. These specialized cells are responsible for regulating blood sugar levels by releasing insulin in response to high blood glucose levels. Insulin helps cells absorb glucose from the bloodstream, thereby lowering blood sugar levels.

Correct Answer: B

Rationale: The exchange of gases, specifically oxygen and carbon dioxide, occurs in the lungs. In the lungs, oxygen from the air we breathe enters the bloodstream, while carbon dioxide is removed from the bloodstream and exhaled. This process is essential for respiration and supplying the body with oxygen for energy production.