edson sospeter
Jan 31
Describe 6 negative feedback mechanism????
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Jan 31
1. Blood clotting: When a blood vessel is damaged, platelets in the blood release chemicals that attract more platelets to the site of injury. This leads to the formation of a blood clot, which helps to stop bleeding and promote healing.
2. Childbirth: During labor, the contractions of the uterus stimulate the release of oxytocin, a hormone that causes more contractions. This positive feedback loop continues until the baby is delivered.
3. Lactation: When a baby suckles at the breast, it stimulates the release of oxytocin, which causes the milk letdown reflex. This leads to more suckling and further release of oxytocin, creating a positive feedback loop that helps to establish and maintain breastfeeding.
4. Thermoregulation: When the body temperature rises, the hypothalamus in the brain triggers sweating and dilation of blood vessels in the skin. This helps to cool the body down. As the body temperature decreases, the sweating and dilation of blood vessels decrease, creating a positive feedback loop that helps to maintain a stable body temperature.
5. Action potential propagation: In neurons, the depolarization of the cell membrane during an action potential triggers the opening of voltage-gated ion channels, allowing more ions to flow into the cell. This depolarizes neighboring regions of the membrane, leading to the propagation of the action potential along the neuron.
6. Blood sugar regulation: When blood sugar levels rise after a meal, the pancreas releases insulin, which promotes the uptake of glucose by cells and the storage of excess glucose as glycogen. This leads to a decrease in blood sugar levels. Conversely, when blood sugar levels drop, the pancreas releases glucagon, which stimulates the breakdown of glycogen and the release of glucose into the bloodstream. This helps to maintain stable blood sugar levels.
2. Childbirth: During labor, the contractions of the uterus stimulate the release of oxytocin, a hormone that causes more contractions. This positive feedback loop continues until the baby is delivered.
3. Lactation: When a baby suckles at the breast, it stimulates the release of oxytocin, which causes the milk letdown reflex. This leads to more suckling and further release of oxytocin, creating a positive feedback loop that helps to establish and maintain breastfeeding.
4. Thermoregulation: When the body temperature rises, the hypothalamus in the brain triggers sweating and dilation of blood vessels in the skin. This helps to cool the body down. As the body temperature decreases, the sweating and dilation of blood vessels decrease, creating a positive feedback loop that helps to maintain a stable body temperature.
5. Action potential propagation: In neurons, the depolarization of the cell membrane during an action potential triggers the opening of voltage-gated ion channels, allowing more ions to flow into the cell. This depolarizes neighboring regions of the membrane, leading to the propagation of the action potential along the neuron.
6. Blood sugar regulation: When blood sugar levels rise after a meal, the pancreas releases insulin, which promotes the uptake of glucose by cells and the storage of excess glucose as glycogen. This leads to a decrease in blood sugar levels. Conversely, when blood sugar levels drop, the pancreas releases glucagon, which stimulates the breakdown of glycogen and the release of glucose into the bloodstream. This helps to maintain stable blood sugar levels.
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