At rest only about 15% of arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate is supplied to the arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate.
The remaining cardiac output (85%) supplies the bodies arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate.

On exercise the working muscles need more arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate so more of the cardiac output must be arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate to the muscles.
As exercise intensity increases the cardiac output directed to the working muscles arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate.

The blood supply to other organs is arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate except to the arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate where the blood supply is maintained.

Blood supply to the skin is increased during light exercise to lower arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate.

This process of redistributing cardiac output is called the arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate.

Small arteries (arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate) and arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate sphincters in the muscles arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate (get wider). This allows more blood to flow through.

The arterioles and pre capillary sphincters supplying organs arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate (get narrower) which arteriolesbraincardiac outputdecreaseddecreasesdirectedincreasesmusclesorgansoxygenpre capillarytemperaturevascular shunt mechanismvasoconstrictvasodilate the blood flow to organs.