Answer:
E. Vasoconstriction.
Explanation:
Vasoconstriction is narrowing or constriction of the blood vessels. It happens when smooth muscles in blood vessel walls tighten. This makes the blood vessel opening smaller. Vasoconstriction may also be called vasospasm.
Vasoconstriction is a normal process. It helps keep your body in healthy balance.
Vasoconstriction may occur to:
stabilize blood pressure or raise blood pressure
reduce loss of body heat in cold temperatures
control how blood is distributed throughout your body
send more nutrients and oxygen to organs that need them
protect your body against blood and fluid loss
Answer:
Vasoconstriction.
Explanation:
In order to prevent excessive blood loss or to cut shut blood flow from injured blood vessels the smooth muscles on the walls of large arteries and veins usually undergo involuntary contraction, so that the sizes of diameter is decreased, and therefore blood loss is stopped.
This natural blood loss preventing mechanism is called Vasoconstriction.It can be triggered by both external and internal factors, but coordinated by combination both hormonal and nervous system.
