The area of the brain stem involved in controlling forced expirations is called (the)
A) pneumotaxic center.
B) dorsal respiratory group.
C) ventral respiratory group.
D) apneustic center.
E) None of the answers are correct.
C) ventral respiratory group.
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Interferons are one of the classes of
A. interleukins. B. cytokines. C. colony-stimulating factors. D. tumor necrosis factors.
Which of the following is DECREASED during exercise?
A. End-expiratory lung volume B. heart rate C. cardiac output D. breathing frequency E. tidal volume
How do cardiac muscle fibers differ from the muscle fibers of the arms and legs?
A. Longer muscle fibers than the limbs B. Non-striated fibers rather than striated fibers C. Poorer supply of blood than the limbs D. Routine involuntary movement
The lower respiratory tract includes
A) only the lungs. B) all of the bronchial branches. C) all of the bronchial branches, the lungs, and the trachea. D) only the trachea. E) all of the bronchial branches and the lungs