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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. The number of hair follicles does not increase with age. In fact, there is a gradual decrease in the number of hair follicles as one ages.
B. Decreased sebum production is a common skin change associated with aging. Sebum helps keep the skin moisturized, and as its production decreases with age, the skin tends to become drier.
C. Skin elasticity actually decreases with age due to the breakdown of collagen and elastin fibers, leading to wrinkles and sagging.
D. Epidermal permeability tends to increase with age, as the skin becomes thinner and more fragile, making it easier for substances to pass through.
Correct Answer is C
Explanation
A. GABA (gamma-aminobutyric acid) is an inhibitory neurotransmitter in the central nervous system, meaning it generally reduces neuronal excitability and does not play a role in excitatory neuromuscular transmission.
B. Glycine is also an inhibitory neurotransmitter, mainly in the spinal cord, and works to prevent over-excitation of neurons, not directly involved in neuromuscular transmission.
C. Acetylcholine is the primary neurotransmitter responsible for neuromuscular transmission. It binds to receptors on muscle cells, causing depolarization and triggering muscle contraction, thus playing an excitatory role.
D. Serotonin primarily functions in the brain to regulate mood, appetite, and sleep but does not play a direct role in neuromuscular transmission.
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