Question 7. The first heart sound (lubb) is closely associated with which of the events listed below?        Pulmonary semilunar valve closing
       Aortic semilunar valves opening
       Bicuspid valve closing
       Tricuspid valve closing
       Both C and D

Question 8. The T wave on the electrocardiogram corresponds with _____.        atrial depolarization
       ventricular depolarization
       atrial repolarization
       ventricular repolarization
       intra-atrial delay

Question 9. The volume of blood ejected from the left ventricle into the aorta each minute is called the _____.        cardiac output
       cardiac input
       stroke volume
       heart rate
       pulse pressure

Question 10. Stimulation of which component of the nervous system increases heart rate?        Sympathetic
       Parasympathetic
       Enteric
       Somatic sensory
       Pontine intrapneutic center

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