1.       Receptors are specific – they only detect one particular stimulus, e.g light, pressure or glucose concentration.

2.       There are many different types of receptor that each detects a different type of stimulus.

3.       Some receptors are cells, e.g photoreceptors are receptor cells that connect to the nervous system. Some receptors are proteins on cell surface membranes e.g glucose receptors are found in the cell membranes of some pancreatic cells.

4.       Here’s a bit more about how receptor cells communicate information via the nervous system work:

·         When a nervous system receptor is in its resting state (not being stimulated), there’s a difference in voltage (charge) between the inside and outside of the cell – this is generated by ion pumps and ion channels. The difference in voltage across the membrane is called the potential difference.

·         The potential difference when a cell is at rest is called resting potential. When a stimulus is detected, the cell


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