Which of the following occurs during the expiratory phase of respiration?
The diaphragm relaxes.
Oxygen is taken into the lungs.
The diaphragm contracts.
Oxygen is released from the lungs.
The Correct Answer is A
A. During the expiratory phase of respiration, the diaphragm relaxes and moves upward, causing the chest cavity to decrease in size and forcing air out of the lungs. This is a key part of the breathing process.
B. Oxygen is not taken into the lungs during expiration. Instead, expiration is the process of expelling carbon dioxide from the lungs after oxygen has been absorbed during inspiration.
C. The diaphragm contracts during the inspiratory phase to increase the volume of the lungs and draw air in, not during expiration.
D. Oxygen is not released from the lungs during expiration; rather, carbon dioxide is expelled from the lungs as a waste product of metabolism.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. The endoplasmic reticulum (ER) is involved in the synthesis of proteins and lipids, but it is not responsible for ATP production.
B. Lysosomes are responsible for breaking down waste materials and cellular debris, but they do not play a role in ATP production.
C. Mitochondria are the powerhouses of the cell, where ATP is produced through cellular respiration. They convert nutrients into energy, making them the primary site for ATP production.
D. Ribosomes are responsible for protein synthesis, not ATP production. They are found in the cytoplasm and on the rough endoplasmic reticulum.
Correct Answer is D
Explanation
A. The stomach plays a key role in digestion by breaking down food mechanically and chemically but does not play a significant role in nutrient absorption.
B. The large intestine is primarily involved in water and electrolyte absorption, as well as the formation of feces. It does not significantly contribute to nutrient absorption.
C. While some digestion begins in the mouth, particularly with enzymes in saliva, nutrient absorption does not occur there.
D. The small intestine is the primary site of nutrient absorption in the digestive system. Its walls are lined with villi and microvilli that increase surface area for the absorption of nutrients such as carbohydrates, proteins, fats, vitamins, and minerals.
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