Ch 19 Heart test B

Atrial systole begins
A. immediately before the P wave.
B. during the Q wave.
C. immediately after the P wave.
D. immediately after the T wave.
E. during the S-T segment.

Atrial depolarization causes
A. the T wave.
B. the first heart sound.
C. the P wave.
D. the quiescent period.
E. the QRS complex.

The long plateau in the action potential observed in cardiocytes is probably related with _____________ staying longer in their cytosol.
A. K+
B. Cl-
C. Na+
D. Na+, K+, and Ca2+
E. Ca2+

When the left ventricle contracts, the _____ valve closes and the _____ valve is pushed open.
A. tricuspid; pulmonary
B. tricuspid; aortic
C. bicuspid; pulmonary
D. mitral; aortic
E. aortic; pulmonary

Mitral valve stenosis causes blood to leak back into the ___________ when the ventricles contract.
A. pulmonary trunk
B. right atrium
C. aorta
D. pulmonary arteries
E. left atrium

Isovolumetric contraction occurs during the _________ of the electrocardiogram.
A. S-T segment
B. P wave
C. P-Q segment
D. R wave
E. T wave

During isovolumetric contraction, the pressure in the ventricles
A. falls and then rises.
B. remains constant.
C. falls rapidly.
D. rises rapidly.
E. rises and then falls.

Mitral valve prolapse (MVP) generates a murmur associated with the _____ heart sound that occurs when the ____.
A. lubb (S1); ventricles contract
B. dupp (S2); atria relax
C. dupp (S2); ventricles relax
D. lubb (S1); atria contract
E. lubb (S1); ventricles relax

This is the correct sequence of events of the cardiac cycle.
A. ventricular filling → ventricular ejection → isovolumetric contraction → isovolumetric relaxation
B. ventricular filling → isovolumetric relaxation → isovolumetric contraction → ventricular ejection
C. ventricular filling → isovolumetric contraction → ventricular ejection → isovolumetric relaxation
D. ventricular filling → isovolumetric contraction → isovolumetric relaxation → ventricular ejection
E. ventricular filling → isovolumetric relaxation → ventricular ejection → isovolumetric contraction

Most of the ventricle filling occurs
A. when the AV valve is closed.
B. during atrial diastole.
C. during ventricular systole.
D. during isovolumetric contraction.
E. during atrial systole.

Congestive heart failure (CHF) of the right ventricle
A. can cause pulmonary edema.
B. reduces the ejection fraction of the left ventricle.
C. increases the ejection fraction of the right ventricle.
D. can cause systemic edema.
E. increases cardiac output in both ventricles.

Assume that the left ventricle of a child's heart has an EDV=90mL, and ESV=60mL, and a cardiac output of 2,400 mL/min. His SV and HR are
A. SV=40 mL/beat, HR=60 bpm.
B. SV=80 mL/beat, HR=30 bpm.
C. SV=30 mL/beat, HR=80 bpm.
D. SV=150 mL/beat, HR=16 bpm.
E. SV=16 mL/beat, HR=150 bpm.

_____________ increase(s) stroke volume.
A. Negative inotropic agents
B. High arterial blood pressure
C. Increased afterload
D. Increased venous return
E . Dehydration

The volume of blood ejected by each ventricle in one minute is called
A. the afterload.
B. the cardiac reserve.
C. the stroke volume.
D. the preload.
E. the cardiac output.

Cardioinhibitory centers in the _____________ receive input from __________.
A. medulla oblongata; chemoreceptors in the aortic arch
B. cortex; proprioceptors in the muscles
C. pons; baroreceptors in the internal carotid
D. hypothalamus; proprioceptors in the joints
E. thalamus; chemoreceptors in the medulla oblongata

The Frank-Starling law of the heart states that stroke volume is proportional to
A. the afterload.
B. the end-systolic volume.
C. the end-diastolic volume.
D. the heart rate.
E. contractility.