A circulation in which the blood flows through the heart once during each circulation of the body e.g. fish
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What is a closed circulatory system?
The blood is always in vessels
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What is an advantage of a closed circulatory system?
- There is an increased rate of flow and so delivery of substances flow can be diverted and directed
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Why are the walls of the left ventricle very thick?
The blood is pumped around the entire body so needs to be under a high pressure.
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Why are the walls of the atria very thin?
They do not need to create much pressure as they are only pushing blood into the ventricles.
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Why are the walls of the right ventricle thicker than the walls of the atria?
They only need to pump blood to the lungs. The blood vessels of the lungs are also very thin, so they would burst if the blood was under too much pressure.
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What does the SAN do?
The SAN initiates a wave of excitation at regular intervals.
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Other cards in this set
Card 2
Front
What is a closed circulatory system?
Back
The blood is always in vessels
Card 3
Front
What is an advantage of a closed circulatory system?
Back
Card 4
Front
Why are the walls of the left ventricle very thick?
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