Circulation

Objective Be able to explain how the heart pumps blood around the body

Look at the word CIRCULATION

What does the first part of the word

sound like?

CIRC…….

CIRCULATION

cir·cu·la·tion

CIRCLE CIRCULAR CIRCULATE

Arteries•Have thick walls

•Carry oxygenated

(red) blood away

from the heart to the

body

•Blood moves at

high pressure Veins•Have thin walls

•Carry

deoxygenated

(blue) blood to the

heart from the body

RED BLOOD CELLS

THIN CELL WALL

BODY CELLS

Capillary•Have thin walls

•Walls are one cell

thick

•Substances are

able to pass in and

out of the blood

The dissolved food and

oxygen needed for

respiration are carried

around the body by the

circulation system.

The circulation system

includes the blood, blood

vessels, the heart and

the lungs.

body’s

cells

body’s

cells

lungslungs

Which part of the circulation

system carries dissolved

food and oxygen to the

body’s cells?

body’s

cells

lungslungs

Blood travels from

the heart to the

lungs

Blood picks up

oxygen from the

lungs and gives out

carbon dioxide

Oxygenated blood

travels back to the

heart

Oxygenated blood

travels from the

heart to the body

Body cells use

oxygen and give

blood CARBON

DIOXIDE

DEOXYGENATED

blood travels from the

body to the heart

body’s

cells

body’s

cells

lungslungs1. Blood travels

from the heart to

the lungs

2. Blood picks up

oxygen from the

lungs and gives out

carbon dioxide

3. Oxygenated

blood travels back

to the heart

4. Oxygenated

blood travels from

the heart to the

body

5. Body cells use

oxygen and give

blood CARBON

DIOXIDE

6. DEOXYGENATED

blood travels from the

body to the heart

The blood carries oxygen and dissolved food to all the body’s

cells so that respiration can take place.

Blood

RED BLOOD CELLS

THIN CELL WALL

BODY CELLS

usefulsubstances

wasteproducts

The heart is made of very special

muscle called cardiac muscle.

This is because it has to keep

beating for the whole of a

person’s life!

If you tried to do the same action

repeatedly (like the heart does),

your muscles would get tired and

after a while stop working.

Your beating heart

For example, if you keep clenching and unclenching your

hand, it will get tired and may even start to get cramp.

Why is it important for respiration that the heart keeps

beating?

EXERCISE Stand up and count pulse for 1 min.

When I say go…..do star jumps PROPERLY for 1

minute

When I say stop – stand still again and count pulse for

1 minute

EXERCISE

The body needs to release more energy:

so oxygen and sugar (glucose) need to reach

muscle cells quickly;

so blood is pumped around the body faster;

so the pulse is faster.

What happens to the pulse rate

whilst someone is running and

why?

Different types of

activity

What happens to the pulse rate

whilst someone is sleeping?

Circulation

W

What have

you learned?