All about the heart and blood vessels!

The heart

?
What does the pulmonary artery do?
Pump deoxygenated blood to the lungs
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What does the pulmonary vein do?
brings oxygenated blood back from the lungs
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What do the cords in the heart do?
attach the atrioventricular valves to the ventricles to stop them being forced up into the atria when the ventricles contract
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Why do the ventricles have thicker walls than the atria?
because they have to push blood out of the heart, whereas the atria just need to push blood a short distance to the ventricles
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Why does the left ventricle have thicker walls than the right ventricle?
needs to contract powerfully to pump blood all the way round the body but right side only needs to get blood to the lungs, which are nearby
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What does the vena cava do?
bring deoxygenated blood back from the body
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If there is higher pressure behind a valve, is it forced open or shut?
open
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If there is higher pressure in front of a valve, is it forced open or shut?
shut
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Why do arteries have elastic tissue in the walls?
to cope with the high pressure caused by the heartbeat
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Why is the endothelium in the artery folded?
to allow the artery to expand, helping it to cope with high pressure
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Do arteries have thick or thin muscle layer?
Thick
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Do veins have a thick or thin muscle wall?
Thin
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Do veins contain valves?
Yes
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Do arteries contain valves?
No
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How is blood helped to flow through veins?
by contraction of body muscles surrounding them
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Are veins elastic?
No
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Which has a larger lumen - arteries or veins?
veins
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What are the networks of capillaries in tissues called?
Capillary beds
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Why are capillary walls (endothelium) only one cell thick?
To speed up diffusion
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Other cards in this set

Card 2

Front

What does the pulmonary vein do?

Back

brings oxygenated blood back from the lungs

Card 3

Front

What do the cords in the heart do?

Back

Preview of the front of card 3

Card 4

Front

Why do the ventricles have thicker walls than the atria?

Back

Preview of the front of card 4

Card 5

Front

Why does the left ventricle have thicker walls than the right ventricle?

Back

Preview of the front of card 5
View more cards

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