Question

What are the body's physiological responses to blood loss?

Answer 1

Blood loss may result from injury or trauma to muscles, organs or blood vessels. Severe loss of blood can lead to hemorrhagic shock, coma and death.
The body exhibits general and local responses to compensates loss of blood.
The body response to loss of blood can be depicted through following flow chart :

Blood loss—> low arterial blood gases and Blood pressure drops —> activation of baroreceptors and chemoreceptors—> sends signal to cardiac centre in brainstem—> activation of sympathetic innervation—> stimulates adrenal gland to release adrenaline and noradrenaline—> vasoconstriction of blood vessels—> increased blood pressure and conservation of blood flowing to peripheral—> increased cardiac output—> increased blood volume