The movement of air in and out of the lungs is called __________.
a) tidal volume
b) pulmonary gas exchange
c) cellular respiration
d) pulmonary ventilation
Answer: d) pulmonary ventilation
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In the systemic circulation, the PO2 of arterial blood exceeds the PO2 of venous blood, while the reverse is true for the pulmonary circulation.
Answer the following statement true (T) or false (F)
The negative charge established along the cytosolic border a nerve cell membrane is due to
a. movement of sodium ions into the cell b. movement of proteins out of the cell c. higher permeability of K+ relative to Na+ d. movement of proteins through membrane channels e. both b and d
Macrophages are cells specialized for ________.
A. secretion B. phagocytosis C. transport D. absorption E. support
The slowest category of nerve fibers are the
A. A fibers, and they conduct impulses at 10 meters per second. B. C fibers, and they conduct impulses at 1 meter per second. C. C fibers, and they conduct impulses at 100 meters per second. D. D fibers, and they conduct impulses at 0.01 meter per second. E. D fibers, and they conduct impulses at 0.1 meter per second.