Neuron As Structural And Functional Unit Of Neural System Flashcards
three parts of a neuron
cell body
dendrites
axon
cell body contains granular bodies called
Nissl’s granules
an axon terminates as a bulb-like structure called _________________________ which possess synaptic vesicles containing chemicals called ____________________
synaptic knob
neurotransmitters
three types of neurons based on number of processes
multipolar
bipolar
unipolar
where are multipolar neurons found
cerebral cortex
where are bipolar neurons found
retina of eye
where are unipolar neurons found
embryonic stage
types of axons
myelinated
non-myelinated
myelinated nerve fibres are found where
spinal and cranial nerves
non myelinated nerve fibres are found where
autonomous and somatic neural system
when neuron is not conducting any impulse, the azonal membrane is comparatively more permeable to ___________ ions and nearly impermeable to __________ ions
potassium
sodium
axoplasm contains high concentration of ___________ ions and _______________ and extracellular fluid contains high concentration of ____________ ions
potassium
negatively charged proteins
sodium
sodium-potassium pump transports ___ sodium _________ and _____ potassium ________ the cell
3, outside
2, inside
two types of synapse
electrical
chemical
difference between electrical and chemical synapses
in electrical, pre and post synaptic membranes are very close, it is fast, it is rare
in chemical, synaptic cleft has fluid, neurotransmitters are involved, slower
