The Heart

​The purpose of this part of the program is to trace the path of the blood from the time it enters the heart to the time it returns to the heart to again pass through the same cycle.

​Blood entering the heart flows into the right atrium.

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When blood flows into the heart, it first enters the right

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The

atrium is the part of the heart which first receives blood.

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Blood entering the heart flows into the

​When blood enters the heart, it enters the right atrium as indicated in the following diagram:

​

​From the right atrium the blood passes through a valve known as the tricuspid valve.

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From the right atrium the blood flows through the tri

valve.

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Blood entering the heart flows into the

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The valve by which blood leaves the right atrium is known as the

valve.

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The blood flows out of the right atrium through the

.

Draw

In the following diagram, label the right atrium

​The blood flows through the tricuspid valve into the right ventricle.

​

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After the blood passes through the tricuspid valve it enters the

. ventricle.

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The right

receives the blood passing through the tricuspid valve.

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Blood enters the heart at the

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From the right atrium the blood passes through the _____ valve and enters the ______.

Draw

Label the right ventricle, the right atrium, and the tricuspid valve.

​From the right ventricle the blood passes through the semilunar valves (semi means half and lunar refers to the moon, so they are half-moon shaped valves.

​

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From the right ventricle blood flows out through the semi

valves.

Multiple Choice

The valves by which the blood leaves the right ventricle are called the

• semi-moon valves

• half-lunar valves

• semi-lunar valves

• half-moon valves

​After passing through the semilunar valves the blood enters the pulmonary artery.

​

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From the semilunar valves the blood enters the

artery

Multiple Choice

Blood flows from the right ventricle through the semilunar valves to the:

• tricuspid valves

• left ventricle

• right atrium

• pulmonary artery

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The pulmonary

receives the blood after it passes through the semilunar valves.

​The pulmonary artery carries the blood to the lungs.

​

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Blood flows from the semilunar valves into the ______ _____ and then goes to the _____

Multiple Choice

Let's review: Blood enters the heart at the ___ and flows through the ___ into the ___.

• left atrium, tricuspid valve, left ventricle

• right atrium; tricuspid valve, right ventricle

• right atrium, semilunar valve, right ventricle

• right atrium, bicuspid valve, left ventricle

Multiple Choice

From the right ventricle the blood then flows through the ___ into the ___, which carries blood into the ___ .

• semilunar valves, pulmonary artery, lungs

• tricuspid valve, left atrium; bicuspid valve

• right atrium, semilunar valves, lungs

• semilunar valves, lungs, right ventricle

​In the lungs the pulmonary artery subdivides into many tiny branches called capillaries (pronounced kap' il er iz)

​

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The blood flowing through lungs passes through many tiny

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The capillaries receive the blood from the

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When the pulmonary artery subdivides, it breaks up into many tiny branches called

​The capillaries in the lungs are in direct contact with many tiny air sacs called alveoli (pronounced al ve' o li)

​

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The tiny air sacs are called

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The blood flows to the lungs, through the capillaries, around the air sacs called

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In the lungs the pulmonary artery subdivides into many branches called ___, which carry blood around the air sacs called ___.

​As the blood flows around the alveoli, it picks up oxygen and at the same time gives off carbon dioxide.

​

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As the blood flows through the lungs it picks up

from the alveoli.

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As the blood flows through the lungs it gives up

to the alveoli.

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The blood picks up oxygen from and gives off carbon dioxide to the

.

​The blood flows through the capillaries, around the alveoli, and then enters the pulmonary veins.

​

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After the blood picks up oxygen from and gives off carbon dioxide to the alveoli, it flows into the

veins.

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The pulmonary

receives blood once it passes around the alveoli.

Multiple Choice

So, blood flows to the lungs through the

• pulmonary vein

• pulmonary artery

Multiple Choice

Then it flows into the capillaries, around the alveoli and then into the

• pulmonary vein

• pulmonary artery

​The pulmonary veins then carry blood away from the lungs.

​

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Blood flows from the lungs through the _____ and enters the heart at the _____

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The pulmonary veins carry blood from the _____ to the ______

​From the lungs the blood flows through the pulmonary veins to the left atrium, after which it flows through the bicuspid valve into the left ventricle.

​

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The blood flows from the left atrium to the

through the bicuspid valve.

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The left

receives the blood flowing through the bicuspid valve.

​From the left ventricle the blood passes through another set of semilunar valves

​

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When the blood leaves the left ventricle it flows through a set of

valves.

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From the left atrium the blood flows though the

valve into the left ventricle.

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Then from the left ventricle the blood flows though the

valve.

​From the semilunar valves the blood flows into the main artery, the aorta (pronounced a or' ta)

​

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The artery which receives the blood from the left ventricle after passing through the semilunar valves is called the

.

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Blood flows from the lungs through the ________ and enters the heart at the _________

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From the left atrium the blood flows through the ____valve into the _________

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From the left ventricle the blood flows through the ____valve into the ____

​From the aorta the blood goes to all parts of the body, eventually flowing into the vena cava from which it enters the right atrium to begin the cycle again.

​

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The artery by which the blood leaves the left ventricle is called the

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From the aorta the blood travels to all parts of the body, finally returning to the

cava.

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The vena

receives the blood returning from all parts of the body.

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After the blood flows through the aorta to all parts of the body, it flows into the

.

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From the vena cava the blood flows into the

and begins the cycle all over again.

​Okay! One final review.

Let's see how well you remember!

​

Multiple Choice

Blood enters the heart at the:

• right atrium

• right ventricle

• left atrium

• left ventricle

Multiple Choice

Blood enters the heart at the:

• right atrium

• right ventricle

• left atrium

• left ventricle