Hormone signalling
While hormones in the blood come in contact with a number of cells, they influence only the cells which have receptors for each specific hormone.
- Endocrine signalling is when the hormones influence specific cells from a distance. For example, the pituitary gland near the brain secretes growth hormones affecting the body all over.
- Paracrine signalling is when hormones influence the neighbouring cells.
- In autocrine signalling, the hormones cause changes within the cell that releases them.
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