The walls of the alveoli
A. are composed of simple squamous epithelium.
B. contain several layers of smooth muscle.
C. contain goblet cells.
D. are surrounded by cartilage.
E. are ciliated.
A
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Clenching the fingers to make a fist, then relaxing and straightening them is an example of ________ followed by ________.
A. extension; hyperextension B. abduction; adduction C. extension; flexion D. adduction; abduction E. flexion; extension
Which of the following does NOT contribute to the longer lasting and more widespread effects observed with sympathetic activation versus parasympathetic activation?
a) Norepinephrine is more slowly removed from synapses than ACh. b) Additional norepinephrine is released from the adrenal gland. c) Greater divergence occurs in sympathetic neural pathways. d) Blood flow to the hypothalamus is decreased when sympathetic activation occurs.
Irregular heartbeats (arrhythmias) have been known to be related to abnormal levels of which ion?
A. Chloride B. Peroxide C. Bicarbonate D. Potassium
Blood vessels enter the eye and nerve processes exit the eye at the
A. optic disc. B. macula lutea. C. sensory retina. D. fovea centralis. E. pupil.