HESI A2 Anatomy and Physiology Practice Test 2023

Correct Answer: B

Rationale: The correct answer is B: To break down food. The stomach's main function is to mechanically and chemically break down food through the action of stomach acids and enzymes. This process prepares the food for further digestion in the small intestine. Option A is incorrect because nutrient absorption primarily occurs in the small intestine, not the stomach. Option C is incorrect as bile is produced by the liver and stored in the gallbladder, not the stomach. Option D is incorrect because waste storage occurs in the large intestine, not the stomach. The process of breaking down food in the stomach is essential for the efficient absorption of nutrients in the digestive system.

Correct Answer: B

Rationale: The correct answer is B: To break down food. The stomach's main function is to mechanically and chemically break down food through the action of stomach acids and enzymes. This process prepares the food for further digestion in the small intestine. Option A is incorrect because nutrient absorption primarily occurs in the small intestine, not the stomach. Option C is incorrect as bile is produced by the liver and stored in the gallbladder, not the stomach. Option D is incorrect because waste storage occurs in the large intestine, not the stomach. The process of breaking down food in the stomach is essential for the efficient absorption of nutrients in the digestive system.

Correct Answer: B

Rationale: The correct answer is B: To fight infections. The immune system's primary function is to protect the body from harmful pathogens such as bacteria, viruses, and parasites. It does this by identifying and destroying these invaders to prevent infections and maintain overall health. Choices A, C, and D are incorrect because transporting oxygen is the role of the respiratory system, producing energy is the role of the metabolic system, and regulating body temperature is the role of the thermoregulatory system, not the immune system.

Correct Answer: B

Rationale: The correct answer is B: To pump blood throughout the body. The heart's primary function is to act as a muscular pump that circulates blood, delivering oxygen and nutrients to the body's tissues and removing waste products. It plays a crucial role in maintaining the flow of blood through the circulatory system. Explanation of other choices: A: To filter blood - This is incorrect, as the kidneys are responsible for filtering blood. C: To absorb oxygen - This is incorrect, as the lungs are responsible for absorbing oxygen. D: To remove carbon dioxide - This is incorrect, as the lungs are responsible for removing carbon dioxide during respiration.

Correct Answer: A

Rationale: The correct answer is A: To produce bile. The liver produces bile, which is essential for the breakdown and absorption of fats in the small intestine. B is incorrect because the storage of glucose is primarily done in the liver, not for digestion. C is incorrect as the pancreas, not the liver, secretes digestive enzymes. D is incorrect as while the liver does play a role in detoxification, its primary function in digestion is bile production.