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- Positive feedback can occur during severe blood loss.
- Under normal conditions, the heart pumps blood to deliver oxygen and nutrients.
- Severe blood loss causes a decrease in blood pressure (BP).
- Reduced blood pressure decreases oxygen delivery to cells.
- Lower oxygen levels cause cells, including heart cells, to function less efficiently.
- Weakened heart cells reduce the pumping action of the heart.
- Decreased heart pumping further lowers blood pressure (BP).
- Continued blood loss creates a worsening cycle of declining function.
- This cycle is an example of a positive feedback system.
- Severe disruption of this cycle can lead to death without medical intervention.
- Blood clotting is another example of a positive feedback system.
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