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How do precapillary sphincters help regulate blood pressure and body temperature?
the Precapillary Sphincters control blood pressure and body temperature by regulating the flow of blood to the capillary bed.
Blood flow through capillaries is regulated by?
Precapillary sphincters
The amount of blood that flows into capillaries is regulated by?
precapillary sphincters
If the precapillary sphincters are contracted by which route will the blood flow?
through the shunts
Which sphincters function as regulatory valves that reduce the flow of blood through a network of capillaries when they contract and constrict the arterioles?
Precapillary sphincters
What structures in capillary beds open to allow the capillaries to perfuse with blood?
precapillary sphincters
Precapillary sphincter is used for what purpose?
Precapillary sphincters are small, ring-like muscles that can close or open parts of a capillary bed, depending on the oxygen and nutrient demands for the tissue
What would not result in the dilation of the feeder arterioles and opening of the precapillary sphincters in systemic capillary beds?
a local increase in pH
The structures composed of smooth muscle that direct the flow through capillary bed are called?
precapillary sphincters
What would not result in thedilation of the feeder arterioles and opening of the precapillary sphincters in the systemic capillary beds?
a local increase in pH
What muscles control the flow of blood through the capillaries?
There are no muscles in arteries. Arterioles have muscles which can close them, but which has no normal flow control. (Used is stress/shock conditions only) Capillaries have a muscle which can stop all flow through it - it responds to oxygen pressure and is the ultimate control of blood flow.
What is the function of precapillary sphincters?
The precapillary sphincter reduces or stops the flow of blood into the capillary when its smooth muscles contract. Its relaxation dilates the opening and allows blood to enter the capillary at a faster rate. The precapillary sphincters open when carbon dioxide levels rise as the tissues need more oxygen. They close when carbon dioxide levels decrease or when the body is under sympathetic stimulation.
