Circulatory System

Question 1

Blood

Answer 1

Made of 3 different types of cells and liquid called plasma

Question 2

Red blood cells

Function

Answer 2

To carry oxygen

Question 3

Structure

Answer 3

Does not have a nucleus and contains a chemical called haemoglobin which requires iron in the diet

Question 4

White blood cells

Function

Answer 4

Decent against disease in 2 ways

(i) engulf bacteria that enter the blood
(ii) make antibodies to kill bacteria

Question 5

Structure

Answer 5

Have a nucleus no def shape

Question 6

Platelets

Function

Answer 6

Clot blood

Question 7

Structure

Answer 7

Tiny fragments of cell

Question 8

Plasma

Answer 8

It is the liquid part of the blood

Question 9

Function

Answer 9

Carries dissolved substances around the body

Question 10

Blood vessels

Answer 10

There’s 3 types

• Arteries
• Veins
• Capillaries

Question 11

Arteries

Answer 11

Carry blood away from the heart

Question 12

Arteries

Answer 12

Carry blood under high pressure it’s coming directly from the heart
Need thick walls
Lumen is narrow

Question 13

Arteries

Answer 13

Blood is flowing fast in pulses

Don’t have valves

Question 14

Veins

Answer 14

Carry blood to the heart

Question 15

Veins

Answer 15

Under low pressure it is not coming from the heart directly

Have thin walls lumen is wide

Question 16

Veins

Answer 16

Blood flows slowly not in pulses

Valves flowing backwards

Question 17

Capillaries

Answer 17

Exchanges substances between the blood and cells

Question 18

Capillaries

Answer 18

Join arteries and veins
Don’t have valves
One cell thick

Question 19

Double circulation

Answer 19

Consists of 2 circuits
1: carries blood to the lungs then back to the heart
2: carries blood to the body and back to the heart
Happens because it stops oxygenated and deoxygenated blood mixing together