Quizlet HESI A2 Anatomy and Physiology

Correct Answer: A

Rationale: Vitamin C is the correct answer as it enhances the absorption of non-heme iron found in plant-based foods. It forms a strong bond with iron, making it easier for the body to absorb. Vitamin D helps with calcium absorption, Vitamin K is crucial for blood clotting, and Vitamin B12 is important for nerve function and red blood cell production. However, they do not directly assist in iron absorption like Vitamin C does.

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: Pineal gland. The pineal gland is located in the brain and is responsible for producing melatonin, which regulates sleep-wake cycles. Melatonin is not produced by the thyroid gland (B), pituitary gland (C), or adrenal gland (D). The thyroid gland produces hormones that regulate metabolism, the pituitary gland regulates various hormones, and the adrenal gland produces hormones like cortisol and adrenaline. Therefore, the pineal gland is the correct answer as it specifically produces melatonin.

Correct Answer: B

Rationale: The primary function of the digestive system is to break down food through mechanical and chemical processes, and absorb nutrients for the body's energy and growth. This process involves enzymes, acids, and various organs like the stomach and intestines. Option A is incorrect as oxygen transportation is primarily done by the respiratory system. Option C is incorrect as hormone production is mainly regulated by the endocrine system. Option D is incorrect as blood transportation is the role of the circulatory system.

Correct Answer: B

Rationale: The correct answer is B: Vitamin D. Vitamin D is necessary for the absorption of calcium in the intestines. It helps regulate calcium and phosphorus levels in the blood, promoting bone health. Vitamin C (A) plays a role in collagen synthesis, not calcium absorption. Vitamin A (C) is important for vision and immune function, not calcium absorption. Vitamin K (D) is crucial for blood clotting, not calcium absorption.