chapter one
Quiz by hussein
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5 questions
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- Q1which of the following substances regulates muscle actions?tropomyosinpotassuimtroponincalcium60s
- Q2which of the following substances acts at neuromuscular junction to excitethe muscle fibers of a motor unit?ATPserotoninacetylcholinecreatine phosphate60s
- 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 that stretch by reflexively increasing muscle activity?extrafusal musclemuscle spindleGolgi Tendon OrganPacinian corpuscle60s
- Q4from which of the following is the heart's electrical impulse normally initiated?AV nodethe braingSA nodethe sympathetic nervous system60s
- 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 ventricle II . repolarization of the ventricleI and II onlyII and IV onlyI, II, and IV onlyII, III, and IV only60s