Category: Cardiovascular system

A. Increase in heart rate
B. Decreased vagal discharge
C. Increased sympathetic discharge
D. Decrease in blood pressure

A. Due to closure of semilunar valves
B. Is occasionally split
C. Has longer duration than 1st heart sound
D. Marks the onset of diastole

A. Lasts till cardiac contraction
B. Longer than refractory period in skeletal muscle
C. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus
D. Corresponds with duration of action potential
E. All of the above

A. AV Valve closes
B. When ventricular pressure falls below aortic pressure
C. When ventricular pressure falls below atrial pressure
D. None of the above

A. Liver
B. Brain
C. Kidney
D. Heart

A. 0.7 seconds
B. 0.3 seconds
C. 0.7 seconds
D. 0.4 seconds

A. AV node
B. SA node
C. SA node
D. Purkinje fibers

A. Does not operate in the failing heart
B. Does not operate during exercise
C. Explains the increase in cardiac output that occurs when venous return is increased
D. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

A. is capable of generating impulses
B. Has rich sympathetic innervation
C. Has poor cholinergic innervation
D. Generates impulses at the highest rate

A. Isovolumetric contraction
B. Isovolumetric relaxation
C. Pre-diastole
D. Pre-systole