An elongated cleft is a(n) ________.
A) foramen
B) fissure
C) meatus
D) canal
E) antrum
fissure
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Demyelination
A) is the addition of myelin to the axon. B) only affects Schwann cells. C) is the gradual reduction in myelin. D) is the thickening of the myelin sheath. E) only affects oligodendrocytes.
Macrophages termed "dust cells" are particularly prominent in which portion of the respiratory system?
a. Extrapulmonary bronchi b. Lamina propria of the trachea c. Pharyngeal tonsils d. Pulmonary alveoli e. Pulmonary bronchioles
An isotonic contraction is described as
A. action potential frequency is high enough that no relaxation of muscle fibers occurs. B. a muscle produces constant tension during contraction. C. a muscle produces an increasing tension during contraction. D. a muscle produces increasing tension as it shortens. E. a muscle produces tension, but the length of the muscle is increasing.
Regulation of pH is accomplished by changing blood oxygen levels.
Answer the following statement true (T) or false (F)