The Blood System Flashcards

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1
Q

What does the circulatory system do?

A

Transport substances around the body

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2
Q

What is the heart?

A

An organ that pumps blood around the body

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3
Q

What is much of the heart wall made from?

A

Muscle tissue

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4
Q

How many main chambers are there in the heart?

A

4

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5
Q

What are the main chambers?

A

Left and right atria, left and right ventricles

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6
Q

Where does the blood enter in the heart?

A

Atria

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7
Q

How do the atria force blood into the ventricles?

A

They contract

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8
Q

How do the ventricles force the blood out of the heart?

A

They contract

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9
Q

What do valves in the heart ensure?

A

That blood flows in the right direction

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10
Q

Where does blood flow from the heart to?

A

The organs

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11
Q

What type of blood vessel does blood flowing towards the organs travel in?

A

Arteries

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12
Q

What type of blood vessel does blood flowing towards the heart travel in?

A

Veins

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13
Q

How many circulatory systems are there?

A

2

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14
Q

What is each of the circulatory systems for?

A

One for the lungs, one for all the other organs of the body

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15
Q

What type of walls do arteries have?

A

Thick walls

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16
Q

What do artery walls contain?

A

Muscle and elastic fibres

17
Q

What type of walls do veins have?

A

Thinner walls

18
Q

What are often found in veins? Why?

A

Valves, to prevent back-flow of the blood

19
Q

When are stents used?

A

When arteries begin to narrow and restrict blood flow

20
Q

What are capillaries?

A

Very narrow, thin walled blood vessels

21
Q

Where are capillaries found?

A

In organs

22
Q

Where do substances needed by cells in body tissues pass out of the blood through?

A

The walls of the capillaries

23
Q

Where do substances produced by cells pass into the blood through?

A

Walls of the capillaries

24
Q

Why are stents good? 3

A

They open arteries almost anywhere in the body, no anaesthetic needed, lower the risk of heart attacks in people with coronary diseases

25
Q

Why are stents bad? 3

A

They can’t open blocked arteries, stents can irritate the artery and make scar tissue grow, the patient has to take drugs to stop the blood clotting on the stent