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Diagnostic reportTEAS 7 · sample

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Lesson · Science5 min

How blood flows through the heart

In 30 seconds

The heart has four chambers: two atria receive, two ventricles pump.
The right side pumps to the lungs; the left side pumps to the body.
Blood crosses tricuspid, pulmonary, mitral, then aortic valves.

Step-by-step animationPractice questions

TEAS Math · Sample questionTry it

A patient is prescribed 0.25 mg of a medication. Each tablet contains 0.125 mg. How many tablets should the nurse give?

Correct. Divide the ordered dose by the dose per tablet: 0.25 ÷ 0.125 = 2. Writing the units out shows you what cancels.

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Watch it step by stepBlood flow through the heart

Oxygen-poor blood returns from the body through the superior and inferior venae cavae into the right atrium.

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Oxygen-poor blood returns from the body through the superior and inferior venae cavae into the right atrium.

From the right atrium, blood passes through the tricuspid valve into the right ventricle.

The right ventricle contracts and pushes blood through the pulmonary valve into the pulmonary trunk, which splits into the pulmonary arteries.

In the lung capillaries, blood releases carbon dioxide and picks up oxygen. It leaves the lungs oxygen-rich.

The pulmonary veins carry the oxygen-rich blood to the left atrium. (These are the only veins that carry oxygen-rich blood in an adult.)

From the left atrium, blood passes through the mitral (bicuspid) valve into the left ventricle.

The left ventricle has the thickest wall. It contracts and pushes blood through the aortic valve into the aorta.

Arteries branching from the aorta deliver oxygen-rich blood to body tissues, which take up oxygen and give off carbon dioxide. The blood returns oxygen-poor, and the loop repeats.

In a real heartbeat both sides work at the same time: both atria contract together, then both ventricles. The right side pumps to the lungs (pulmonary circuit); the left side pumps to the body (systemic circuit).

Two students studying anatomy with a skeleton model

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