EKG Unit 1 Exam

As blood returns to the heart from the body, it enters __________.

• The left atrium

• The superior vena cava

• The pulmonary arteries

• The right atrium

What is the pericardium?

• A valve in the heart

• The membrane enclosing the heart

• The partition that separates the right and left side of the heart

• None of the above

Where does the myocardium get its nourishment from?

• Aorta

• Coronary arteries

• Hepatic portal arteries

• Liver

What is a complete cardiac cycle?

• The beginning of a beat until the beginning of the next beat

• The volume of blood ejected from the ventricle in one minute

• The volume of blood ejected from the ventricle in one heartbeat

• The number of beats per minute

What happens if the blood supply to the myocardium stops?

• Nothing

• Only the area that does not receive blood dies

• The heart decreases

• The patient dies

The heart is a dual action pump

• True

• False

Three valves regulate blood flow through the heart.

• True

• False

What function does the SA node serve?

• It generates the stimulus to make the heartbeat

• It supplies the heart with more nourishment

• It lets the heart relax after beating

• It initiates the opening and closing of the heart valves

Trace the order of impulse in the Conduction System: FIRST

• The AV node

• The AV bundles

• The Purkinje fibers

• The sinoatrial node

Trace the order of impulse in the Conduction System: SECOND

• The SA node

• The AV node

• the right and left bundle branches

• the purkinje fibers