Negative vs Positive Feedback

As a person gets dehydrated, their blood becomes thicker and harder to pump.

As this happens, the kidneys stop producing urine and the water from urine is redirected for use in the blood.

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As a person’s blood sugar lowers, the pancreas releases a chemical called glucagon to return the blood sugar back to normal.

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Rapid growth during puberty causes the release of more growth hormones.

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As a person’s blood sugar rises, the pancreas releases a hormone called insulin to return the blood sugar back to normal.

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When tissue is injured, the cells release chemicals to activate platelets to help stop the bleeding.

The platelets then release more chemicals to activate even more platelets to help stop bleeding.

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When a baby suckles milk from his/her mother, a nerve in the mother’s nipple sends a signal to her brain which stimulates the production of even more milk.

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If calcium in the blood decreases, the parathyroid glands sense the decrease and secretes a hormone to release stored calcium from the bones, into the bloodstream.

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