Cardiovascular - Heart

How much blood does the human heart pump through it per minute (on average)?

• 1/2 gallon

• 1 gallon

• 1 and 1/2 gallons

• 3 gallons

Which is a function of the pericardium?

• Prevents overfilling of the heart.

• Forms a continuous lining with the vessels attached to the heart.

• It is the muscle layer of the heart.

• Signals the heart to beat.

_____ conducts blood away from the heart.

• Capillaries

• Veins

• Arteries

• Atria

When the ventricles contract, the pressure inside the chamber opens the (a)   valves.

During embryonic development, about 1% of cardiac muscle fibers become self excitable. Clusters of these cells are called ____.

• Purkinje fibers

• nodes

• atrioventricular bundle

• septum

The largest wave in an EKG is known as....

• T wave

• QRS wave

• P wave

• U wave

In an EKG, the QRS wave represents...

• atrial depolarization

• ventricular repolarization

• fibrillation

• ventricular depolarization

Tags

NGSS.HS-PS2-5

In the sequence of excitation of the heart, which structure generates impulses about 75 times a minute?

• Atrioventricular bundle

• Atrioventricular node

• Sinoatrial node

• Bundle branches

In the cardiac cycle, the ventricles expand to hold the blood. At one point, the ventricles have all the blood they can hold before they contract. What is this called?

• End diastolic volume

• End systolic volume

• Isovolumetric relaxation

• Atrial systole

Ventricular repolarization is represented by which wave on the EKG?

• U wave

• P wave

• QRS wave

• T wave