This is called Immunity . The body is then immune to that microbe. Clotting Blood clotting is very important because we cut ourselves regularly and this is a good route for microbes to enter the body. When the skin is cut, platelets are released in large numbers. This sets off a chain of reactions which prepare the wound site for repair.
Blood contains a soluble protein called fibrinogen .
This is converted into insoluble fibres of fibrin which makes a mesh over the wound. Blood cells and platelets are caught in this mesh and the wound is sealed with a scab. A very clever system for reducing blood loss and preventing more microbes from entering the body. Question 1 Choose one of the answers for each question. Question 2 Drag the correct microbe to each disease it causes.