CIE A Level Biology復習筆記15.1.4 Sensory Receptor Cells
Sensory Receptor Cells
- A cell that?responds?to a?stimulus?is called a?receptor cell
- Receptor cells are?transducers?– they?convert energy?in one form (such as light, heat or sound) into energy in an?electrical impulse?within a sensory neurone
- Receptor cells are often found in?sense organs?(eg. light receptor cells are found in the eye)
- Some receptors, such as light receptors in the eye and chemoreceptors in the taste buds, are specialised cells that detect a specific type of stimulus and influence the electrical activity of a sensory neurone
- Other receptors, such as some kinds of touch receptors, are just the ends of the sensory neurones themselves
- When receptors cells are stimulated they are?depolarised
- If the?stimulus?is very?weak, the cells are?not sufficiently depolarised?and the sensory neurone is not activated to send impulses
- If the?stimulus?is?strong?enough, the sensory neurone is?activated?and?transmits impulses to the CNS
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