Which of the following is a function of the musculoskeletal system?

Correct Answer: C

Rationale: The correct answer is C: Stores calcium and phosphorus. The musculoskeletal system plays a crucial role in storing minerals like calcium and phosphorus, which are essential for bone health and muscle function. Bones act as a reservoir for these minerals, releasing them when needed for various bodily functions. This function helps maintain the body's mineral balance and supports overall skeletal strength. Explanation for why the other choices are incorrect: A: Storing vitamin D is primarily done by adipose tissue and the liver, not the musculoskeletal system. B: Supplying oxygen to cells is the role of the respiratory and circulatory systems, not the musculoskeletal system. D: Transporting antibodies to cells is the function of the immune system, involving the lymphatic system and blood circulation, not the musculoskeletal system.

Correct Answer: B

Rationale: The correct answer is B: Dorsiflexion. Bending backward is the movement of bringing the top of the foot towards the shin, which is dorsiflexion at the ankle joint. Rotation (A) refers to turning around an axis, not bending backward. Supination (C) is the upward rotation of the forearm, not bending backward. Opposition (D) is the movement of the thumb towards the fingers, not bending backward. Therefore, the correct term for bending backward is dorsiflexion.

Correct Answer: B

Rationale: The correct answer is B (4 hours) because repositioning a resident on a mechanical ventilator is crucial to prevent pressure ulcers and maintain proper ventilation. Repositioning every 4 hours helps distribute pressure, improve circulation, and prevent skin breakdown. Choice A (5 hours) is too long, increasing the risk of complications. Choice C (3 hours) may be too frequent and could disrupt the patient's rest. Choice D (2 hours) is too frequent and may not allow enough time for the patient to rest and heal. Therefore, B is the most appropriate interval for repositioning a resident on a mechanical ventilator.

Correct Answer: B

Rationale: The correct answer is B: Obsessing over small things. Burnout often leads to heightened sensitivity and fixation on minor issues, causing individuals to obsess over small details. This behavior is a sign of emotional exhaustion and reduced effectiveness. Choices A, C, and D are incorrect as burnout typically manifests as increased irritability, decreased patience, and heightened frustration levels. These symptoms are contrary to the characteristics described in choices A, C, and D.

Correct Answer: C

Rationale: Low potassium can cause arrhythmias; the surgeon must be notified preoperatively.