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 bloodstream. This is essential for cellular respiration and energy production. Perspiration (A) is regulated by the sweat glands, not water intake. Cells do not retain waste products (B) but rather eliminate them through various body systems. Water does not increase body temperature (C) but helps regulate it through sweating and cooling mechanisms.

Correct Answer: D

Rationale: The correct answer is D: 50. Prostate cancer risk increases with age due to factors like hormonal changes and cell mutations over time. At age 50, men are more likely to develop prostate cancer compared to younger ages. Men over 70 have an even higher risk, but the question specifies an age where the risk starts to increase, making 50 the most appropriate choice. Choices A, B, and C are incorrect as they do not reflect the typical age range where prostate cancer risk significantly rises.

Correct Answer: A

Rationale: Step-by-step rationale: 1. Myocardial ischemia is a condition where the heart muscle doesn't receive enough oxygen. 2. Oxygen is crucial for the heart to function properly and generate energy. 3. Lack of oxygen can lead to chest pain (angina) or a heart attack. 4. Therefore, with myocardial ischemia, the person lacks oxygen, making choice A correct. Summary: - Choice A (Oxygen) is correct as myocardial ischemia involves oxygen deficiency. - Choices B, C, and D are incorrect as they are not directly related to the lack of oxygen in myocardial ischemia.

Correct Answer: B

Rationale: The correct answer is B: Provide support to an extremity. A sling is used to support and immobilize an injured or weak arm or shoulder. It helps in reducing movement and preventing further injury. Choice A is incorrect because a sling is not used to increase swelling but rather to reduce swelling by providing support. Choice C is incorrect because a sling is not used to immobilize broken bones; it is used to support the limb while the bones heal. Choice D is incorrect because a sling does not inflate or deflate an extremity; it only provides support.

Correct Answer: B

Rationale: The correct answer is B (70 to 100 mg/dl). This range is considered normal for a person without diabetes as it reflects healthy blood glucose levels. Values below 70 may indicate hypoglycemia, while values above 100 may indicate prediabetes or diabetes. Choice A is too low and suggestive of hypoglycemia. Choices C and D are too high and indicate hyperglycemia, which is not normal for someone without diabetes. Therefore, B is the correct answer based on the typical fasting blood glucose range for a healthy individual.