Neurones and Receptors
- Created by: Sarah
- Created on: 26-01-15 13:11
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- Neuronal system
- Sensory Receptors
- Pressure
- pacinian corpulscles in the skin
- Sight
- rods and cones in the retina
- Smell
- olfactory cells in the nose
- Taste
- taste buds in the tongue
- Sound
- receptors in the inner ear
- Muscle movement
- proprioreceptors
- they convert energy from one form to another
- detect the STIMULUS and convert it into a NERVE IMPULSE
- Pressure
- Resting potential
- -60mV
- more negative inside the axon
- maintained by sodium potassium pumps
- POLARISED
- has a potential difference across the membrane
- 3Na OUT 2K IN
- Generator Potential
- (1) Stimulus occurs
- (2) Gated Na channels open
- (3) a FEW Na ions move in
- (4) small depolarisation
- Neurones
- Sensory neurones
- receptor --> CNS
- long dendrons
- cell body just outside the CNS
- short axon
- Relay neurones
- sensory neurones --> motor neurones
- Motor neurones
- CNS --> Effector
- cell body IN the CNS
- long axon
- long = transmit over a long distance
- gated sodium channels
- sodium - potassium pumps
- insultating schann cells (myelin sheath)
- cell body containing the nucleus, mitochondria and ribosomes
- Sensory neurones
- Sensory Receptors
- Sensory neurones
- receptor --> CNS
- long dendrons
- cell body just outside the CNS
- short axon
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