Question

Three main parts of a nerve cell and explain the direction of impulse flow throughout the nerve cell.

Answer 1

the three main parts are

1. Dendrites- It receives the electric impulse

2. Axon - it helps in transmitting the electric impulse from the dendrites to the axon terminal

3. The axon terminal- it has neurotransmitter that changes electric impulse to chemical impulse so that it can travel across the synapse and can reach the next neuron

The impulse is received by dendrites, it is then passed through the cell body of the neuron. The impulse then moves through the myelinated  in axon(the neurons actually jumps from one myelinated   sheet to the other to avoid the non  myelinated sheet). The electric impulse when once reaches the terminal and the  neurotransmitter like Dopamine , Acetyl cholione changes the electric impulse into chemical messages that can easily  travel   through the synapse( the junction between two neurons). The chemical message is changed into electric impulse by the  dendrite of the next neuron. This process continues to pass the impulse from one neuron to the other.

HOPE IT WILL HELP YOU !!!!!!!

Answer 2

$\large \bold{Nerve \: cell}$

Nerve cell is also known as $\bold{Nueron}$, is the smallest functional unit of nervous system.

$\bold{The \: three \: main \: part \: of \: neuron \: are}$

$\bold{\star Cell \: body}$

▶Cell body is also known as perikaryon or cyton.

▶It contains a large nuclei, with granular cytoplasm and have all cell organelles except centrsome which implies they don't divide or increase in number.

$\bold{\star Dendrites}$

▶Dendrites are branches or projection of cell body.

▶ They convey nerve impulses to cyton.

$\bold{\star Axon}$

▶It continues from cell body and longest part of neuron.

▶Its surrounded by insulating white sheath myelin which is further covered with thin sheet neurilemma. The gaps between myelin sheath are called $\bold{Nodes \: of \: ranvier .}$

▶Axons are close but are not connected these gaps are called synaptic clefts.

$\large \bold{Direction \: of \: impulses }$

▶The dendrites receives impulses which might have passes to it by near by neuron.

▶The axon transits the impulse through out its lenght.

▶When the impulse reaches to axon ending, a chemical acetylcholine is released, which makes synapse ready for the impulse to jump and to reach the dendrite of other neuron.