Neuron Physiology How do nerves transmit signals and
- Slides: 17
Neuron Physiology How do nerves transmit signals and communicate? www. liv. ac. uk/
Neurons Selectively permeable to Na+ and K+ n At rest, membrane is polarized; K+ inside cell, Na+ outside cell n
n Sodium channels open and allow Na+ to diffuse into the cell
n Inside of cell temporarily more positive than the outside n Depolarization
n Potassium Outside of cell channels open allowing K+ to flow out of cell Inside of cell
n Negative charge is restored on inside of membrane n Repolarization
Video from Kahn Academy n https: //www. khanacademy. org/scienc e/biology
Action Potential n Action Potential = an electrical event occurring when a stimulus is applied allowing for Na+ to enter the neuron and reverse the polarity of the cell
Action Potential n Localized event n Self-propagating n Moves in one direction Impulse Animation http: //kvhs. nbed. nb. ca/gallant/biology/action_potential_propagation. jpg
n Impulse travels down axon n Reaches terminal branches – synaptic knobs
n Within synaptic knobs are synaptic vesicles – Contain neurotransmitters (ex: acetylcholine) Synaptic vesicles fuse with membrane n Release contents into synaptic cleft n
n Neurotransmitters diffuse across the gap and attach to receptors on receiving neuron. n Permeability of membrane changes n Na+ diffuse into receiving cell n Impulse continues n Neurotransmitter removed or destroyed. Transmission Across a Synapse Animation
Neurotransmitters n Acetylcholine = responsible for control of muscle tissue n Histamine = responsible for symptoms of allergic reactions n Dopamine = helps to provide feelings of enjoyment n Seratonin = helps to regulate mood
You Tube Videos n Saltatory Conduction (role of myelin) n Anatomy of a nerve n Nerve Impulse
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