20.4b Myogenic Response
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12 Terms
What is the myogenic response?
The ability of smooth muscle in blood vessels to keep local blood flow relatively constant.
What type of muscle is responsible for the myogenic response?
Smooth muscle in the vessel wall.
What is the purpose of the myogenic response?
To maintain stable local blood flow despite changes in blood pressure.
What happens when systemic blood pressure rises?
More blood enters the arteriole and stretches the vessel wall.
How does the arteriole respond to increased stretch?
The smooth muscle contracts.
What is the result of contraction in response to high blood pressure?
Local blood flow returns to normal levels.
What happens when systemic blood pressure decreases?
Less blood enters the arteriole and there is less stretch.
How does the arteriole respond to decreased stretch?
The smooth muscle relaxes.
What is the result of relaxation in response to low blood pressure?
Local blood flow returns to normal levels.
Why is the myogenic response important?
It prevents large fluctuations in blood flow to tissues.
What is the key trigger for the myogenic response?
Stretch of the vessel wall.
Which vessels primarily exhibit the myogenic response?
Arterioles.
