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Unformatted text preview: EXAM III Spring 2007 1) The functional unit of skeletal muscle is the: a) smallest contractile component of a muscle fiber b) area between two Z lines c) sarcomere d) all of these answers e) none of these answers 2) The right half of the heart pumps blood through the _____ circuit and the left half pumps blood through the _____ circuit. a) systolic, diastolic b) coronary, pulmonary c) systemic, pulmonary d) pulmonary, systemic e) systemic, coronary 3) Which of the following ECG waves represents ventricular repolarization? a) P wave b) QRS complex c) T wave d) PR segment e) ventricular polarization occurs simultaneously with atrial depolarization and can not be recorded 4) The term systole means: a) closure b) conduction c) contraction d) opening e) relaxation 5) The term diastole means: a) closure b) conduction c) contraction d) opening e) relaxation 6) The heart valves open and close due to: a) attachment to the heart muscle. b) a pressure difference on the two sides of the valve. c) Na+ and K+ fluxes during ventricular depolarizations. d) turbulent flow in the atria and ventricles. e) none of these answers. 7) Parasympathetic stimulation of the heart: a) increases the heart rate. b) increases Ca2+ permeability and thus increases contractile strength c) decreases K+ permeability resulting in a depolarizing effect at the SA node d) all of the answers e) none of these answers 8) Sympathetic stimulation of the heart: a) increases the heart rate....
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- Fall '07