The Blood System

Question 1

What does the circulatory system do?

Answer 1

Transport substances around the body

Question 2

What is the heart?

Answer 2

An organ that pumps blood around the body

Question 3

What is much of the heart wall made from?

Answer 3

Muscle tissue

Question 4

How many main chambers are there in the heart?

Answer 4

4

Question 5

What are the main chambers?

Answer 5

Left and right atria, left and right ventricles

Question 6

Where does the blood enter in the heart?

Answer 6

Atria

Question 7

How do the atria force blood into the ventricles?

Answer 7

They contract

Question 8

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

Answer 8

They contract

Question 9

What do valves in the heart ensure?

Answer 9

That blood flows in the right direction

Question 10

Where does blood flow from the heart to?

Answer 10

The organs

Question 11

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

Answer 11

Arteries

Question 12

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

Answer 12

Veins

Question 13

How many circulatory systems are there?

Answer 13

2

Question 14

What is each of the circulatory systems for?

Answer 14

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

Question 15

What type of walls do arteries have?

Answer 15

Thick walls

Question 16

What do artery walls contain?

Answer 16

Muscle and elastic fibres

Question 17

What type of walls do veins have?

Answer 17

Thinner walls

Question 18

What are often found in veins? Why?

Answer 18

Valves, to prevent back-flow of the blood

Question 19

When are stents used?

Answer 19

When arteries begin to narrow and restrict blood flow

Question 20

What are capillaries?

Answer 20

Very narrow, thin walled blood vessels

Question 21

Where are capillaries found?

Answer 21

In organs

Question 22

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

Answer 22

The walls of the capillaries

Question 23

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

Answer 23

Walls of the capillaries

Question 24

Why are stents good? 3

Answer 24

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

Question 25

Why are stents bad? 3

Answer 25

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