Biology B3 2.2 Keeping the blood flowing.

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What are the main types of blood vessel?
Arteries, veins and capillaries.
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What happens to substances in the capillaries?
Substances diffuse between the blood and the cells in the capillaries.
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How can blocked or narrowed arteries be widened?
Stents can be inserted to keep blood vessels open or widen blood vessels.
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What can be done if heart valves become damaged?
Damaged heart valves can be replaced. Artificial or animal valves can be inserted in the heart to replace damaged valves.
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What do arteries do?
Carry blood away from the heart .
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What is the structure of arteries?
They have thick walls containing muscle and elastic tissue.
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How are veins different to arteries?
They have thinner walls than arteries and often have valves along their length to prevent back flow of blood.
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What is the structure of capillaries?
They are narrow, thin-walled vessels.
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What do capillaries do?
They carry the blood through the organs and allow the exchange of substances with all the living cells in the body.
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What keeps the blood flowing through the blood vessels?
The heart.
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What happens if blood vessels are blocked or too narrow?
The blood will not flow efficiently.
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What happens when blood cannot flow efficiently?
The organs will be deprived of nutrients and oxygen.
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When are stents particularly beneficial?
When coronary arteries become narrowed due to fatty deposits, cutting off the blood supply to the heart muscle.
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What is the implication of a leaky valve?
Leaky valves mean the blood could flow in the wrong direction.
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**MAKE SURE YOU CAN EXPLAIN WHY A NARROWED BLOOD VESSEL OR LEAKY VALVE CAUSES PROBLEMS FOR A PERSONS HEALTH*****
***LOOK UP DIAGRAMS AND FAMILIARISE*****
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Other cards in this set

Card 2

Front

What happens to substances in the capillaries?

Back

Substances diffuse between the blood and the cells in the capillaries.

Card 3

Front

How can blocked or narrowed arteries be widened?

Back

Preview of the front of card 3

Card 4

Front

What can be done if heart valves become damaged?

Back

Preview of the front of card 4

Card 5

Front

What do arteries do?

Back

Preview of the front of card 5
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