Lab midterm review

The _________ is the pacemaker of the heart

Mrs. Hems suffered a heart attack resulting in valve failure. A papillary muscle that controls the valve in her left ventricle has been severely damaged and is no longer working. What valve is affected?

• Bicuspid valve

• Tricuspid valve

• Aortic valve

• Pulmonary valve

The___________artery delivers deoxygenated blood to the lungs

Which of the following terms describes the amount of blood in the ventricles after filling

• End diastolic volume

• End systolic volume

• Heart rate

• Cardiac output

What ion is involved in depolarization in autorhythmic cells?

Which of the following ions is involved in the repolarization phase in cardiac contractile cells?

• Sodium

• Potassium

• Chloride

• Sodium and Potassium

Venous return and ________ are directly related

In order to maintain cardiac output which of the following would occur if stroke volume decreased?

• Heart rate would increase

• Heart rate would decrease

• Heart rate would remain the same

Which of the following occurs after an action potential leaves the AV node?

• Travels to the bundle of his

• Travels to the SA node

• Travels to the purkinje fibers

• Travels to the left and right bundle branches

The______wave is associated with atrial depolarization