Question

Irritability is the main function.right manner by which nerve impulse is transmitted from one part to another part through neuron is

Answer 1

The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of electrical changes across the membrane of the neuron. The membrane of an stimulated neuron is polarized—that is, there is a difference in electrical charge between the outside and inside of the membrane.

Neurons are excitable cells. They may be stimulated by physical, mechanical, chemical or electrical stimuli. The axoplasm inside the axon contains a high concentration of potassium ions, negatively-charged proteins and a low concentration of sodium ions. On the contrary, the fluid outside the axon contains a low concentration of potassium and a high concentration of sodium. This differential permeability is maintained.

The information is received at the dedritic tip of a neuron. This creates an electrical impulse, which travels from dendrites to cell body and then along the axon.A junction helps transmit the nerve impulse from one neuron to another. These junctions are called synapses. A synapse is formed by the membranes of a pre-synaptic neuron and a post-synaptic neuron At the end of axon, the electrical impulse sets off the release of some chemicals, which cross the synapse to the next neuron.The neurotransmitters bind to their specific chemoreceptors present on the post-synaptic membrane of the dendron. This binding opens sodium ion channels that allow the entry of ions to generate a new potential in the post-synaptic neuron.