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what is conductivity?
chemical transmission of a nerve impulse between neurons-> across a synapse or synaptic junction
- a.axon of pre-synaptic neuron
- c.synaptic knob
- d.synaptic vesicle
- e.neurotransmitter receptors
- f.synaptic cleft
- g.post-synaptic neuron plasma membrane
what are synaptic knob at the effector?
what does synaptic vesicle contain
a chemical known as "neurotransmitter"->variety of neurotransmitters
nerve impulse moves down the axon and telodendria of the pre-synaptic neuron, what happens when the nerve impulse reaches synaptic knob?
it causes sunaptic vesicles to fuse with outer membrane and releases neuro transmitter into the synaptic cleft.
neurotransmitter diffuses across synapse and attach to what?
it attaches to the receptors on the post synaptic neuron
attachment of neurotransmitter to the receptors may be:
- a)an EPSP and move post synaptic neuron closer to threshold
- b)an IPSP and move post synaptic neuron farther from threshold
when the post synaptic neuron recieves enough EPSP's to reach threshold....
that initiates an action potential=nerve impulse in post synaptic neuron
how do you end conductivity?
by removing neurotransmitter from the synapse
some neurotransmitter diffuses away into what?
some of the neurotransmitter is reabsorbed by what?
the synaptic knob
what enzyme breaks down the neurotransmitter attached to the receptors?
- a)acetylcholinesterase(cholinesterase)->breaks down acetylcholine
- b)specific enzyme for each neurotransmitter
chemical transmission at a synapse last about 10 times longer than what?
the electrical nerve impulse
one chemical transmission at a synapse cause what?
several action potential in post-synaptic neuron not just 1->short burts of nerve impulses
why does synapse act as a one way valve in the nervous system-> nerve impulse can only travel in one direction across synapse?
- a)dendrites do not have neurotransmitters to release
- b)pre-synaptic neuron does not have neurotransmitter receptors
what is conduction pathway?
route of a nerve impulse from its origin to its termination
what are the 5 basic parts to conduction pathway?
- 2.afferent neuron (sensory neuron)
- 4.efferent neuron
what is the receptor of a conduction pathway?
- it is a specialized structure or the distal end of a sensory neuron dendrite
- a) responds to a stimulus(change in conditions) by initiation an action potential in sensory neuron
what is the afferent neuron(sensory neuron) of a conduction pathway?
it transmits nerve impulse from receptor to the CNS
what is the center of a conduction pathway?
- it is one or more association( internundal) neurons with in the CNS
- a) integrate the nerve impulse by->transmitting nerve impulse, or blocking the nerve impulse, or re-routing nerve impulse or a combination.
what is the efferent neuron(motor neuron) of a conduction pathway?
it transmits nerve impulse from CNS to the effecto
what is the effector of a conduction pathway?
the structure that responds to the nerve impulse-> some form of muscle or a gland
- 2.afferent neuron(sensory neuron)
- 4.efferent neuron
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