Match the term to the definition

• Tricuspid and

  bicuspid valves

• Initiates the action potential that causes the heart to beat.

• Right atrium

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

• SA node

• One of the body’s largest blood vessels that transports blood from the body region

  below the diaphragm to the heart.

• Inferior vena cava

• When blood leaves this chamber of the heart, it heads out to the body.

• Left ventricle

• Prevents blood from flowing back into the atria when the ventricles contract.

Match the following terms to their definition

• Semilunar valves

• Responsible for distributing electrical impulses throughout the heart.

• AV node

• This blood vessel splits in two and sends oxygen-poor blood to the lungs.

• Pulmonary trunk

• When blood leaves this chamber of the heart, it heads to the lungs.

• Left atrium

• The chamber in the heart that receives oxygenated blood from the lungs.

• Right ventricle

• Stops blood from flowing back into the ventricles each time they contract.

________ are the smallest blood vessels with the _________ walls in order to

maximize diffusion of nutrients in and out of the interstitial fluid.

• Capillaries; thickest

• Capillaries; thinnest

• Veins; thinnest

• Arteries; thickest

​________ carry blood towards the heart.

• Nerves
• Veins
• Capillaries
• Arteries

_______ carry blood away from the heart.

• Lungs
• Veins
• Capillaries
• Arteries

Blood traveling in the pulmonary circuit goes through the _________ side of the heart and out to

the _________.

• left, lungs
• right, lungs
• right, heart
• left, heart

Blood traveling in the systemic circuit goes through the ________ side of the

heart and out to the ________ .

• left, lungs
• right, body
• right, lungs
• left, body

Describe the unique property of pacemaker cells and

what they make possible in the heart.

• Pacemaker cells regulate body temperature.
• Pacemaker cells produce hormones for the heart.
• Pacemaker cells store blood in the heart chambers.
• Pacemaker cells generate electrical impulses to initiate and coordinate the heart's contractions.

Why is coronary circulation an essential process?

• Coronary circulation supplies nourishment to the heart muscle.

• Coronary circulation only supplies blood to the brain.
• Coronary circulation is not important for heart function.
• Coronary circulation supplies deoxygenated blood to the heart muscle.

Label the chambers of the heart

a

b

c

d

Right Atrium

Right Ventricle

Left Ventricle

Left Atrium