The HEART

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What happens in Atrial systole?
The Atria contract, atrial pressure rises and blood is pushed from the atria to the ventricles
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What happens in Ventricular systole when the ventricles contract?
Ventricular pressure rises above atrial pressure and the atrioventricular valves shut
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What happens after the ventricles contract?
Ventricular pressure rises but no blood leaves the heart
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What happens when the ventricular pressure rises?
When they rise above pressure in the arteries the semi lunar valves open
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What happens in diastole 1?
The ventricles relac
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What happens after the ventricular pressure falls in the arteries?
The semi lunar valves shut
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What happens in Diastole II?
The entire heart is relaxed
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What valves open?
the atrioventricular valves
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What happens to the atria and ventricles?
They fill with blood
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What do the thick muscle layer do?
They withstand high pressure blood.
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What does the elastic tissue allow?
The artery to strech when blood is forced into it
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What three structure points are left?
collagen layer, round shape and small lumen
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What do the veins have that the arteries haven't got?
Valves and a large lumen
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What else do veins have?
A thin muscle layer
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Other cards in this set

Card 2

Front

What happens in Ventricular systole when the ventricles contract?

Back

Ventricular pressure rises above atrial pressure and the atrioventricular valves shut

Card 3

Front

What happens after the ventricles contract?

Back

Preview of the front of card 3

Card 4

Front

What happens when the ventricular pressure rises?

Back

Preview of the front of card 4

Card 5

Front

What happens in diastole 1?

Back

Preview of the front of card 5
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