Neuron and resting potential Flashcards
parts of a neuron and description
- dendrites - many branched aspects
- body (soma) - genetic and metabolic center of the cell
- axon - fiber for transmission
- terminals - chemicals come out
2 types of transmission in nerve and where
- electrical - dendrite, body, axon
2. chemical - terminal
direction of transfer in nerve
unidirecitonal from dendrites to terminal
3 types of neurons and descriptions
- multipolar - numerous dendrites, single axon
- bipolar - two processes arise from body - one to dendrites, one to terminal
- pseudounipolar - single process arises from body and splits into the two directions
2 processes of pseudounipolar
- periperhal - joins peripheral nerve
2. central - goes to CNS
where are different neurons located
- multipolar- most common - interneurons and motor
- bipolar - special senses
- pseudounipolar - somatic and visceral sensory neurons
what is electrical communication within a cell
transmembrane potential
what is general voltage
-70 to ECF
what is graded potential and where does it occur
- amplitude based on strength of stimulation
- dendrites and cell bodies
what is fixed amplitude and where
- fixed amplitudes, stength based on frequency
- in axon
how do dendrite increase surface area
increase in spines
what does cytoplasm contain
cytoskeletal proteins, mitochondria, ER, ribosomes
what is stim. from sensory neurons and what does it produce
response to stim. generates receptor potentials
what is stim in non-sensory neurons and what is generated
response from NT binding - causes synaptic potential
what demarcates the beginning of an axon
spike initiations zone