Anatomy of the Heart. What is the purpose of a heart? Not all organisms have a heart, what is...
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![Page 1: Anatomy of the Heart. What is the purpose of a heart? Not all organisms have a heart, what is the…](https://reader035.fdocuments.us/reader035/viewer/2022070616/5a4d1c117f8b9ab0599f6f56/html5/thumbnails/1.jpg)
Anatomy of the Heart
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What is the purpose of a heart?
Not all organisms have a heart, what is the advantage of having a heart?
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Different kinds of hearts
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Aortic Arches
The “hearts” of the earthworm
Blood is actually pumped by the dorsal into the aortic arches arches
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2 chambered heart
Blood moves in one direction 2 chambers – atrium and ventricle
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3-chambered heart
2 atriums, and 1 ventricle
Oxygenated blood comes into the left atrium, and deoxygenated blood comes in from the right atrium.
Both atrium lead to the same ventricle
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4 Chambered heart(Human heart)
Has 2 atriums, and 2 ventricles 4 valves
Tricuspid, mitral, aortic, pulmonary Each side receives and sends its own blood
to its respective circuit
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Think, pair, share
Think of the advantages disadvantages of each heart
Pair up (with the person beside you) and discuss you answers
Share your answers with the class
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Advantages/disadvantages 2 chambered heart
Low on energy Not very efficient
3 chambered heart Low on energy Limits organisms
4 chambered heart Very efficient, transports the most blood to the
cells High energy cost
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How does it work?
2 stages of the heart Systole – heart contraction
First the atriums, then the ventricles Diastole heart at rest
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Human Heart