Which of the following is descriptive of the air moved into or out of the lungs during the normal respiratory cycle?
Expiratory reserve volume
Residual volume
Vital capacity
Tidal volume
The Correct Answer is D
A. Expiratory reserve volume is the amount of air that can be exhaled forcefully after normal expiration. It does not refer to the air moved in and out during the normal respiratory cycle.
B. Residual volume is the amount of air remaining in the lungs after a forced exhalation. It cannot be exhaled and is not part of the normal respiratory cycle.
C. Vital capacity is the maximum amount of air that can be exhaled after a maximum inhalation, which includes tidal volume, expiratory reserve volume, and inspiratory reserve volume. It does not specifically refer to the air moved in and out during normal breathing.
D. Tidal volume refers to the amount of air that is moved into and out of the lungs during a normal, relaxed breath. It is the term that directly describes the air exchanged during the normal respiratory cycle.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. The heart is composed of cardiac muscle tissue, not smooth muscle. Cardiac muscle is specialized for rhythmic contractions to pump blood.
B. The rectus abdominis is composed of skeletal muscle tissue, which is voluntary and allows for movement of the trunk.
C. The esophagus contains smooth muscle tissue in its walls, which is responsible for the involuntary contractions (peristalsis) that move food from the mouth to the stomach.
D. The pectoralis major is composed of skeletal muscle tissue, which allows for voluntary control of arm movements.
Correct Answer is D
Explanation
A. The superior and inferior vena cava carry deoxygenated blood from the body to the right atrium, not oxygenated blood to the left atrium.
B. The aorta carries oxygenated blood away from the left ventricle to the rest of the body but does not return it to the heart.
C. The pulmonary arteries transport deoxygenated blood from the right ventricle to the lungs for oxygenation, not the other way around.
D. The pulmonary veins are responsible for transporting oxygenated blood from the lungs to the left atrium, completing the pulmonary circulation.
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