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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