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7 Cards in this Set
- Front
- Back
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define endocrine system? |
communication system using hormones as signalling molecules |
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define hormones |
molecules released by endocrine directly into the blood. They act as messengers carrying a signal from endocrine glands to target cells or organs |
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target cells |
cells with a specific receptor on their plasma membrane, that is complementary to the shape of a hormone. |
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2 types of hormones |
steroid (e.g. oestrogen and testosterone) protein (e.g. adrenaline and insulin) |
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protein hormones |
not soluble in phospholipid bi-layer, so they cant enter the cell. bind to plasma membrane to trigger release of second messenger molecule inside the cell. |
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steroid hormones |
can pass through the plasma membrane and enter the cell. can also enter nucleus to have a direct effect on the cell DNA |
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Endocrine glands |
ductless glands made of groups of cells that make and release hormones directly into the blood via capillaries |
