Anatomy and Physiology Hesi A2 Practice Test

Correct Answer: D

Rationale: The correct answer is D: Pinna. The pinna, also known as the auricle, is the most visible part of the ear. It is the external, cartilaginous structure that helps collect and funnel sound waves into the ear canal. The ear canal, choice A, is not the most visible part as it is mostly within the ear. The cochlea, choice B, and the organ of Corti, choice C, are internal structures within the ear responsible for processing sound signals, but they are not visible from the outside. Therefore, the pinna is the correct answer as it is the visible part of the ear that is easily recognizable on the exterior.

Correct Answer: B

Rationale: The correct answer is B: Left ventricle. The left ventricle is the largest and strongest chamber of the heart because it is responsible for pumping oxygenated blood to the entire body. It has thick muscular walls to generate enough force to propel blood through the systemic circulation. The right atrium (choice A) receives deoxygenated blood from the body, the right ventricle (choice C) pumps this blood to the lungs for oxygenation, and the left atrium (choice D) receives oxygenated blood from the lungs. None of these chambers have the same pumping workload and muscular thickness as the left ventricle, making it the correct answer.

Correct Answer: D

Rationale: The correct answer is D: Pinna. The pinna, also known as the auricle, is the most visible part of the ear. It is the external, cartilaginous structure that helps collect and funnel sound waves into the ear canal. The ear canal, choice A, is not the most visible part as it is mostly within the ear. The cochlea, choice B, and the organ of Corti, choice C, are internal structures within the ear responsible for processing sound signals, but they are not visible from the outside. Therefore, the pinna is the correct answer as it is the visible part of the ear that is easily recognizable on the exterior.

Correct Answer: B

Rationale: The correct answer is B: Endocrine glands secrete chemicals into the blood. This is because endocrine glands release hormones directly into the bloodstream to regulate various physiological functions throughout the body. Other choices are incorrect: A is incorrect as endocrine glands do not absorb chemicals from the blood; C is incorrect because endocrine glands do not filter chemicals from the blood; and D is incorrect as endocrine glands do not absorb chemicals from the lymphatic system.

Correct Answer: D

Rationale: The correct answer is D: Larynx. The larynx is an organ of the respiratory system because it plays a crucial role in producing sound and facilitating the passage of air to the lungs. It contains the vocal cords and is located in the throat. The other choices (A: Pancreas, B: Brain, C: Urethra) are not part of the respiratory system. The pancreas is part of the digestive system, the brain is part of the nervous system, and the urethra is part of the urinary system.