Blood vesselsBlood vesselsArteries, capillaries and veinsArteries, capillaries and veins

Keywords

• Plasma• Platelets• Capillaries• Arteries• Veins• Oxygenated• Deoxygenated• Circulatory• valves

You need to write these down

Blood vessels

Deoxygenated bloodOxygenated blood

Low pressure/Thin walls/ large hole/ valves

High pressure/Thick muscular walls/ small hole/ no valves

One cell thick

Where gas exchange occurs with cells

Away from heart To the heart

You need to draw these

You need to write down a table of differences

Valve

• Needed in veins to stop backflow

• Due to low pressure in veins

varicose

Question

4a) Which diagram shows a slice across an artery, X or Y?

b) Write down one difference between the wall of an artery and the wall of a vein.

c) Write down one difference between the blood in most arteries and the blood in most veins.

d) What would you find in a leg vein which is not shown in the diagram?

Circulatory system

You need to draw this diagram

brain

heart

lungs

liver

gut

kidneys

Blood cellsBlood cellsCarry oxygen

Contain the red pigment haemoglobin

Blood clotting

Fighting infection

You need to draw these

Plasma Red blood cells White blood cells Platelets

Appearance

Statements

1 is about 44% of the blood

6 is a flowing liquid

3 are disc shaped

9 help to seal cuts

5 are fragments of cells

7 can change shape

4 contains haemoglobin 8 carries oxygen

2 contains dissolved nutrients

10 help to protect you from disease

Taking your blood pressure

• Your doctor may take this if you are unwell or have a check up

• Can you test your blood pressure with the machine?

Giving Blood

• You can give blood from the age of 17• You could save a life• It is painless• There are some restrictions on the people who

can give blood• You can give blood every 16 weeks• Red blood cells last 35 days, platelets just 5

days• The demand for blood is increasing

Can you give blood if you?• Are anaemic?• Have a cold at the moment?• Have ever had malaria?• Weigh less than 7 stone 12 lbs?• Are under 17?• Are over 70?• Have ever been paid for sex? • Have paid for sex in the last year ?• Have ever injected drugs?• Have had a piercing in the last 3 months?• Have had a tattoo in the last 3 months?• Have had acupuncture in the last 3 months?• Have had a vaccination in the last 2 months?• Have received blood since 1st January 1980?

The answer to all of these is NO ! There are also lots of other rules

What are the blood groups?

• 0+ 37% of the population• A+ 35%• B+ 8%• 0- 7%• A- 7%• AB+ 3%• B- 2%• AB- 1%

What is the blood used for?

• Cancer, rare diseases and sickle cell treatment – 53%

• Transplant and orthopaedic surgery – 36 %

• Babies/pregnant mothers – 6 %

• Accident victims – 5 %

What is the blood used for-2?

• Red cells – to treat anaemia and sickle cell

• Platelets – leukemia, haemophilia

• Plasma- childbirth, heart surgery

Homework

• Can you design a leaflet to encourage 17 year olds to give blood

• Inform them why they should give blood

• And who can and who cannot give blood