If the radius of the airway increases, what will happen to the airflow resistance?
A. Resistance decreases.
B. Resistance increases.
C. Resistance first decreases, then increases.
D. There is no change in resistance
Ans: A. Resistance decreases.
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A "widow's hump" or "dowager's hump" is an exaggerated thoracic curvature that is technically called __________.
Fill in the blank(s) with the appropriate word(s).
The possibility of some control over autonomic responses is demonstrated by ________.
A) split brain studies B) stress-induced hypertension C) biofeedback D) nightmares
Which of the following is an accurate description of breathing mechanics?
A. The relaxation of the diaphragm expands the thoracic cavity, creating a vacuum that draws in air. B. The contraction of the diaphragm expands the thoracic cavity, creating a vacuum that draws in air. C. The contraction of the diaphragm reduces the thoracic volume, creating a positive pressure that forces air out. D. The contraction of the diaphragm expands the thoracic cavity, creating positive pressure that draws in air.
What are the target cells of the hormone thyroxine?
A. Brain neurons and endocrine cells B. Bone and muscle cells C. Most body cells D. Pancreas and adrenal gland cells