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The Blood Vessels - AQA, GCSE - Organising Animals & Plants £5.48   Add to cart
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The Blood Vessels - AQA, GCSE - Organising Animals & Plants
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-Class notes about all of the blood vessels -Includes info about the adaptations of the blood vessels, if/where they carry blood (to), diagrams of each blood vessel, etc -GCSE Biology, Topic: Organising Animals and Plants -Exam Board: AQA

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  • April 5, 2023
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31/01/2023
The Blood vessels

→Substances transported in the blood need to reach the individual cells. Every cell in
your body within 0.05mm of a capillary - the tiniest blood vessel in the body.
→There are 3 main types of blood vessels:


Arteries
→Carry blood away from your heart to the
organs of the body. This is oxygenated
blood.

→They stretch as blood is forced through
and go back to shape afterwards.

→They have a pulse →where the arteries
run close to the skin's surface (e.g; at your
wrist).

→Have thick walls containing muscle and
elastic fibres.

→As the blood in the arteries is under
pressure, it is very dangerous if an artery
is cut, because the blood will spurt out
rapidly every time your heart beats.


Veins
→Carry blood away from your organs towards your
heart. This is deoxygenated blood.

→ Do not have a pulse.

→Have much thinner walls than arteries and often have
valves to prevent the backflow of blood.

↳Valves open as blood flows through them towards the
heart, but if the blood starts to flow backwards, they clove
and prevent a backflow of blood.

↳Blood is squeezed back towards the heart by the action
of skeletal muscles.

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