Quizlet HESI A2 Anatomy and Physiology

Correct Answer: A

Rationale: The primary role of hemoglobin in red blood cells is to carry oxygen. Hemoglobin binds to oxygen in the lungs and transports it to tissues throughout the body. This is essential for cellular respiration and energy production. Choices B, C, and D are incorrect because hemoglobin's main function is oxygen transport, not carrying nutrients, carbon dioxide, or waste products. Oxygen transport is crucial for the body's overall function and survival.

Correct Answer: A

Rationale: The correct answer is A: To transmit signals and coordinate body activities. The nervous system is responsible for sending and receiving signals throughout the body to regulate various functions and coordinate activities. This includes sensory perception, motor responses, and communication between different parts of the body. The other choices are incorrect because the immune system (B) fights infections, the endocrine system (C) produces hormones, and the thermoregulatory system (D) regulates body temperature, which are functions separate from the primary role of the nervous system.

Correct Answer: A

Rationale: The correct answer is A: To produce bile. The liver's primary function in the digestive system is to produce bile, which aids in the digestion and absorption of fats. B is incorrect because the liver does not secrete digestive enzymes; that is primarily the role of the pancreas. C is incorrect as the liver does not store glucose; it helps regulate blood glucose levels. D is incorrect because the liver does not store bile; instead, bile is stored in the gallbladder.

Correct Answer: A

Rationale: The correct answer is A: To filter waste from the blood. The kidneys act as filters, removing waste products and excess substances from the blood to form urine. This process helps maintain a balance of electrolytes and fluids in the body. Option B is incorrect because the kidneys do not produce urine from scratch; they filter blood to create urine. Option C is incorrect as the kidneys do play a role in regulating blood pressure, but it is not their primary function. Option D is also incorrect because while the kidneys do help maintain fluid balance, their primary function is waste filtration.

Correct Answer: B

Rationale: The correct answer is B: To absorb nutrients. The small intestine plays a crucial role in absorbing nutrients from digested food. It is lined with villi that increase the surface area for nutrient absorption. Other choices are incorrect as the small intestine does not store bile (A), its main role is not to digest food as that is primarily done in the stomach (C), and while it does produce some enzymes, its primary function is not enzyme production (D).