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Wound healing
Tissue damage and pain
The first response to a skin wound is rapid reflex action that takes the
body away from the cause of damage
...
If the wound is involved in a huge
amount of blood loss (hemorrhage) that is not quickly staunched, then
mechanisms that are within the body that rapidly restores blood
pressure and blood volume become active, so the heart continues to
function normally
...
Depending on how bad the wound is there are different levels of the
body’s regulatory activities that are brought into operation
...
A protein
within the blood plasma changes from a soluble form which is known as
fibrinogen and then into insoluble fibers of fibrin that become tangled
together with blood cells and make a dense mat which is a fibrin clot
...
When it dries out, the clot forms a scab
...
Dilated vessels can also carry an increase volume of blood to the wound
region
...
Blood cells get trapped within the fibrin network (white cells)
...
They do this by engulfing cell fragments and bacteria and then digesting
them
...
White cells also carry out this mopping up operation within the blood
itself, by ingesting and digesting dying and damaged blood cells