Cardiac cycle (anatomy)

Which of the following correctly matches the valve to its function?

• Pulmonary valve - permits one-way blood flow from the left ventricle to the aorta

• Mitral valve - permits one-way blood flow from the left atrium to the left ventricle

• Aortic valve - permits one-way blood flow from the right ventricle to the pulmonary trunk

• Tricuspid valve - permits one-way blood flow from the right to the left atrium

The "pacemaker" which spontaneously generates a rhythmic impulse that spreads through the myocardium is known as the ________.

• Sinoatrial Node

• AV Bundle

• Atrioventricular Node

• Junctional Fibers

The superior vena cava empties:

• deoxygenated blood into the left atrium

• deoxygenated blood into the right atrium

• deoxygenated blood into the right ventricle

• oxygenated blood into the left ventricle

The contraction of the ventricles is referred to as ________, and the period of ventricular relaxation is called ________.

• SA Node; AV Node

• Systole; Diastole

• Junctional Fibers; Purkinje Fibers

• Diastole; Systole

Someone with a low potassium level will have a ______________ HR.

• High

• Low

• Static

• Irregular

Which vessel is not very efficient, slow and weak?

• Arterioles

• Capillaries

• Arteries

• Veins

In an ECG pattern, the P wave is caused by

• depolarization of ventricular muscle fibers

• polarization of the muscle fibers

• depolarization of atrial muscle fibers

• polarization of the ventricular muscle fibers

Relative to the roles of the heart chambers, the ________ are receiving chambers, whereas the ________ are discharging chambers.

• bicuspid valve; tricuspid valve

• right atria; left atria

• right pulmonary vein; left pulmonary vein

• atria; ventricles

Pulmonary veins:

• transport blood rich in carbon dioxide to the lungs

• transport oxygenated blood to the heart

• return blood to the right atrium of the heart

• transport oxygenated blood to the lungs

The outermost tissue that forms a loose-fitting sac around the heart is the

• epicardium

• endocardium

• myocardium

• pericardium