the heart contains four chambers which of these four chambers is the largest and the strongest left ventricle left atrium right ventricle right atrium
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HESI A2

Anatomy and Physiology Hesi A2 Practice Test

1. Which of the heart's four chambers is the largest and the strongest?

Correct answer: B

Rationale: The left ventricle is the largest and strongest chamber of the heart. It pumps oxygenated blood to the body, making it vital for systemic circulation. The right atrium receives deoxygenated blood from the body, the right ventricle pumps this blood to the lungs, and the left atrium receives oxygenated blood from the lungs.

2. What is the role of the stomach in digestion?

Correct answer: B

Rationale: The correct answer is B: To break down food. The stomach's primary function in digestion is to mechanically and chemically break down food. It achieves this by utilizing gastric acid and digestive enzymes to convert food into chyme, a semi-liquid mixture. The chyme is then passed to the small intestine for further processing and absorption of nutrients. Choices A, C, and D are incorrect because the stomach's main role is not to absorb nutrients, secrete digestive enzymes, or transport nutrients; instead, it primarily focuses on breaking down food.

3. What is the function of the coronary artery?

Correct answer: D

Rationale: The correct answer is D: 'It supplies blood to the heart muscle.' The coronary artery's main function is to supply oxygenated blood to the heart muscle, ensuring that the heart receives the necessary nutrients and oxygen it needs to function properly. Choices A, B, and C are incorrect because the coronary artery specifically delivers oxygenated blood to the heart muscle, not deoxygenated blood to the lungs or blood to the rest of the body.

4. Where would you be likely to find a Schwann cell?

Correct answer: B

Rationale: Schwann cells are a type of neuroglia found in the peripheral nervous system. They are responsible for producing the myelin sheath around axons of neurons, which helps with the conduction of nerve impulses. Therefore, Schwann cells are typically found in the nervous system. Choices A, C, and D are incorrect because Schwann cells are specifically associated with the nervous system and are not found in the digestive, skeletal, or muscular systems.

5. Which muscle is involved in the flexion of the forearm?

Correct answer: A

Rationale: The biceps brachii muscle is the primary muscle responsible for flexing the forearm at the elbow joint. When the biceps brachii contracts, it causes the forearm to move towards the upper arm, resulting in flexion at the elbow. In contrast, the triceps brachii is responsible for extending the forearm, the deltoid muscle is primarily involved in shoulder movements, and the brachialis muscle also aids in flexion of the forearm but to a lesser extent compared to the biceps brachii.

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