1.1.3 Preventing Blood Loss

Sylabus guided notes for AS OCR Biology (Human) 1.1.3 Preventing Blood Loss

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1.1.3 Preventing Blood Loss
(a) First Aid Treatment
Reassure them. Lie them down and look carefully at the wound. Check for foreign bodies but do not
remove them. Place wading around it to hold it in place.
If the wound is an arm or leg raise it above heart level. If the blood soaks through padding apply more on
top, but do not remove the bottom ones.
(b) Blood Clotting
(c) Enzyme Shape
An enzyme is a globular protein with an active site.
(d) Uses of Enzymes
An enzyme has the ability to reduce the activation energy of a reaction. This means reactions can occur at
body temp and atmospheric temperature. They are able to do this because they have a very specific 3D
shape with an active site. They are exactly the right shape for a specific substrate.
(e) Rates of Enzyme Catalysed reactions


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