Extrasystole of the heart means that it
a. beats too slowly
b. fills with too much blood
c. has a complete block
d. loses blood
e. produces a premature beat
E
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The head of the radius is distal; the head of the ulna is proximal.
Answer the following statement true (T) or false (F)
Mastication is a process that facilitates
A. absorption of nutrients into the bloodstream, and it involves carrier proteins in the epithelium. B. swallowing of food, and it increases the surface area of the food for exposure to enzymes. C. mixing of food within the stomach, and it occurs with simultaneous hormone secretion there. D. propulsion of materials through the intestine, and it involves simultaneous secretion of enzymes.
People who can see close objects but who struggle to see those that are far away have
A. myopia. B. presbyopia. C. hyperopia. D. astigmatism.
Which of the following is clinically significant as an ectopic pacemaker of the heart?
a. drinking several cups of caffeinated coffee b. extrasystole contractions associated with angina pectoris c. excessive smoking d. anxiety