ECG test 1

An electrocardiogram is a recording of the:

• Electrical activity of the heart

• opening and closing of the valves of the heart

• force of the blood against the walls of the blood vessels

• contraction and relaxation of the ventricles

blood enters the right atrium from the:

• pulmonary artery

• superior and inferior vena cava

• pulmonary veins

• aorta

• right ventricle

the left atrium receives:

• deoxygenated blood from the body

• oxygenated blood from the left ventricle

• oxygenated blood from the lungs

• deoxygenated blood from the lungs

which chamber pumps the blood from the heart and out into the body?

• right atrium

• left atrium

• right ventricle

• left ventricle

what is the name given to the knot of modified myocardium that sets the pace of the heart?

• medulla

• AV node

• SA node

• Bundle branches

what structure in the heart delays the electrical impulse momentarily in order to allow the ventricles to fill completely?

• Bundle of His

• AV node

• SA node

• Cuspid Valves

What is the name of the structure in the heart that distributes the electrical impulse to the ventricles?

• epicardium

• endocardium

• bundle of His

• Purkinje fibers

what is a cardiac cycle?

• contraction of the atria

• one complete heartbeat

• relaxation of the entire heart

• contraction of the ventricles

the state in which of the muscle cells of the heart are at rest and the electrical charges are balanced is known as:

• polarization

• homeostasis

• deflection

• repolarization

discharge of electrical energy occurs during:

• repolarization

• negative deflection

• depolarization

• polarization