Cardiovascular SystemATI TEAS 7 cheat sheet

Heart, vessels, circulation

11 key facts 5 practice questions Reviewed Oct 2026

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The Pump

Four chambers: right atrium, right ventricle, left atrium, left ventricle
Atria receive; ventricles pump
The left ventricle is thickest — it pumps to the whole body
Valves stop backflow: tricuspid, pulmonary, mitral, aortic

The Circuit

Body → RA → RV → lungs → LA → LV → body
Pulmonary circuit = heart to lungs
Systemic circuit = heart to the rest of the body

Vessels

Arteries carry blood AWAY from the heart (thick, elastic)
Veins return blood TO the heart; they have valves
Capillaries are one cell thick — where exchange happens

The Exception

The pulmonary artery carries deoxygenated blood; the pulmonary vein carries oxygenated — named by direction, not oxygen

Key takeaway

Heart, vessels, circulation

Before you read

Test yourself first: 5 questions

Question 1 of 5

Which body system includes the heart and blood vessels?

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