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- A negative feedback system reverses a change in a controlled condition.
- Blood pressure (BP) is the force of blood against vessel walls.
- When the heart beats faster or stronger, blood pressure increases.
- A rise in blood pressure acts as a stimulus.
- Baroreceptors detect the increase in pressure.
- Baroreceptors send nerve impulses to the brain.
- The brain acts as the control center.
- The brain sends output signals to the heart and blood vessels.
- The heart rate decreases in response.
- Blood vessels dilate, which lowers resistance.
- These actions cause blood pressure to decrease.
- Blood pressure returns to its normal range.
- The response negates the original stimulus.
- This reversal is why it is called negative feedback.
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