Blood transport system

There are 3 types of blood vessels:

1. Arteries2. Veins

3. Capillaries

ArteriesCarry blood away from the heartThey carry blood at high pressure

You can feel your pulse in an ARTERY

Arteries divide again and again until they finally form tiny blood vessels called..

Capillaries!

Capillaries are the smallest blood vessels,

with very thin walls

Several things pass in and out of them. They are…

Several things pass in and out of them. They are…

• Oxygen out of the lungs• Oxygen and glucose into cells• Carbon dioxide and other

wastes out of the cells• Carbon dioxide into the lungs

Capillaries join together into larger blood vessels

Which then become

Veins

SO!

Capillaries join arteries to veins

VeinsCarry blood back to the heart

They carry blood at low pressureThey have valves to stop blood flowing backwards

Key point notes!

The heart and blood vessels make up the circulatory system.

The 3 kinds of blood vessels are

•Arteries

•Capillaries

•Veins

Blood circulates (goes round the body) like this:

Key point notes!

Arteries are the thickest and strongest as they have to carry blood at high pressure.

Capillaries are the smallest and thinnest. They have thin walls to allow gases, glucose and wastes to diffuse in and out easily. They are in contact with all the cells in the body.

Veins have thinner walls than arteries as they carry blood at low pressure. They are the only ones to have valves!