The Human Heart

The Human Heart

By: Elizabeth Boeve

ED 205 Sec 05

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The Human Heart• Quick Facts about the heart• The Heart’s Job• How the Heart Beats• Heart Parts• The Atria• The Ventricles• Teamwork• The Septum• The Valves• The Lub-Dub• A Healthy Heart• About the Author• Resources

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Quick Facts About The Heart

• Your heart is really a muscle

• Located just to the left of your chest

• About the size of your fist

• Your heart acts as a pump

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The Heart’s Job

• To pump blood throughout your body

• It does this by:

- Pumping deoxygenated blood from your body to your lungs

- Pumping oxygenated blood to from your lungs to your body

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How the Heart Beats

• Before each beat, your heart fills with blood

• The heart muscle then contracts

• When it contracts it squeezes along the blood

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Heart Parts

• The heart is made up of four parts

• Each part is called a chamber

• The two parts at the top are called the atria

• The two parts at the bottom are called the ventricles

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The Atria (singular atrium)

• The atria are the chambers that fill with the blood returning to the heart from the body and lungs.

• The heart has a left atrium and a right atrium

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The Ventricles

• Their job is to squirt out the blood to the body and lungs

• The heart has a left ventricle and a right ventricle

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Teamwork

• The atria and ventricles work as a team — the atria fill with blood, then dump it into the ventricles

• The ventricles then squeeze, pumping blood out of the heart.

• While the ventricles are squeezing, the atria refill and get ready for the next contraction

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The Septum

• Running down the middle of the heart is a thick wall of muscle called the septum

• The septum's job is to separate the left side and the right side of the heart

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The Valves

• Your blood relies on four special valves inside the heart to know which way to flow

• The mitral and tricuspid valves let blood flow from the atria to the ventricles

• The aortic and pulmonary valves are in charge of controlling the flow as the blood leaves the heart

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The Lub-Dub

• A healthy heart makes a lub-dub sound with each beat

• The first sound (the lub) happens when the mitral and tricuspid valves close

• The next sound (the dub) happens when the aortic and pulmonary valves close after the blood has been squeezed out of the heart

Click above to hear the lub-dub of a healthy heart

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A Healthy Heart

• Remember your heart is a muscle – stay active to keep it working (exercise)

• Eat a variety of healthy foods and avoid foods high in unhealthy fats

• Don't smoke - it can damage the heart and blood vessels Click on picture to play video on how

to keep the heart healthy

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The Author

Elizabeth Boeve is majoring in Integrated Sciences with a minor in elementary education. She hopes to create a love for science in little children.

Click Here To Email Me

Resources

Video and Sound Clip

• http://streaming.discoveryeducation.com/

Information and Pictures

www.kidshealth.org/

Pictures

• www.medical-artist.com

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