chapter one
Quiz by hussein
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5 questions
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- Q1which of the following substances regulates muscle actions?calciumtroponintropomyosinpotasium30s
- Q2which of the following substances acts at the neuromuscular junction to excite the muscle fibers of motor unit?acetylcholineATPserotonincreatine phosphate30s
- Q3when throwing a baseball, an athlete's arm is rapidly stretched just before throwing the ball. which of the following structures detects and responds to the stretch by reflexively increase muscle activity?muscle spindleextrafusal musclePacinian corpuscleGolgi tendon organ30s
- Q4from which of the following is the heart's electrical impulse normally initiated?SA nodethe sympathetic nervous systemthe brainAV node30s
- Q5which of the following occurs during the QRS complex of a typical ECG I. depolarization of the atrium. II. repolarization of the atrium . III. depolarization of the ventrical . IV. repolarization of the ventricalI and III onlyII and IV onlyII, III, and IV onlyI, II, and III only30s