Which of the following is a benefit to humans from water intake?

Correct Answer: D

Rationale: The correct answer is D because water helps move oxygen into the cells through the process of blood circulation. Water acts as a medium for transporting oxygen from the lungs to the cells, where it is needed for cellular respiration. This process is essential for providing energy to the body. A is incorrect because water actually helps regulate body temperature by facilitating perspiration. B is incorrect because water aids in the removal of waste products from cells, not in their retention. C is incorrect because water helps regulate body temperature by cooling the body through perspiration, rather than increasing body temperature.

Correct Answer: D

Rationale: The correct answer is D: 50. Prostate cancer risk increases with age due to cell mutations over time. Men over 50 are at higher risk as cell changes accumulate. Answer A (40) is too young for significant risk. Answer B (70) is too late, risk peaks earlier. Answer C (60) is closer but does not capture the critical age range for increased risk.

Correct Answer: A

Rationale: The correct answer is A: Oxygen. Myocardial ischemia occurs when the heart muscle doesn't receive enough oxygen-rich blood. This lack of oxygen can lead to chest pain or discomfort (angina) and potentially a heart attack. Oxygen is essential for the heart muscle to function properly. Choice B: Fluids, while important for overall health, are not directly related to myocardial ischemia. Choice C: White blood cells are part of the immune system and not directly related to the lack of oxygen in the heart muscle. Choice D: Immune function is not the primary issue in myocardial ischemia; the lack of oxygen to the heart muscle is the main concern.

Correct Answer: B

Rationale: The correct answer is B: Provide support to an extremity. 1. A sling is designed to support and elevate an injured extremity to reduce swelling. 2. It helps immobilize and protect the injured area, promoting healing. 3. It prevents further injury by restricting movement. 4. Choices A, C, and D are incorrect because a sling does not increase swelling, immobilize broken bones, or inflate/deflate an extremity.

Correct Answer: B

Rationale: The correct answer is B (70 to 100 mg/dl) because it represents the normal fasting blood glucose range for a person without diabetes. This range is considered optimal for maintaining stable blood sugar levels. Choice A (46 to 78 mg/dl) is too low and indicative of hypoglycemia. Choices C (105 to 120 mg/dl) and D (115 to 132 mg/dl) are too high and suggest hyperglycemia, which is commonly seen in individuals with diabetes. Maintaining blood glucose within the range of 70 to 100 mg/dl is crucial for overall health and prevention of diabetes-related complications.