Cardiovascular System Review

One of the body's largest blood vessels that transports blood from the body region below the diaphragm to the heart is the __.

• Superior vena cava

• Inferior vena cava

• Aorta

• Pulmonary veins

When this chamber contracts, it pushes blood through the tricuspid valve.

• 6

• 7

• 8

• 9

This structure initiates the action potential that causes the heart to beat.

• Inferior vena cava

• Atrioventricular node (AV node)

• Superior vena cava

• Sinoatrial node (SA node)

Which best explains why capillary walls are so thin?

• Because they do not need to pump blood

• Because they are found only in the smallest organs and tissues

• Because they maximize diffusion of nutrients

• Because blood only travels through them slowly

Blood traveling through the systemic circuit goes through the __ side of the heart and out to the body.

• Right

• Left

Which of the following is FALSE about pacemaker cells?

• They allow the heart to beat on its own

• They create their own electrical impulses

• They are part of the sinoatrial node and the atrioventricular node

• They require depolarizing stimulation from the brain

These structures, also known as the heart strings, maintain the position of the atrioventricular valves.

• Papillary muscles

• Chordae tendineae

• SA and AV nodes

• Purkinje fibers

Which part of the heart is this?

• Aorta
• Pumonary Vein
• Pulmonary Artery
• Left Atrium

During the Cardiac Cycle the diastole phase is when?

• The heart is fully contracted

• The heart is fully relaxed

• When the atria are relaxed and Ventricles contracted

Tags

NGSS.HS-LS1-3

What creates the "lub dub" heart sounds?

• Flow of blood
• Closing of valves
• Opening of valves
• Breathing