Explain the process Conduction of a nerve impulse along a nerve fibre
There are two types of nerve fibres - myelinated and non-myelinated. In myelinated nerve fibre, the impulse is conducted from node to node in a mumping manner as myelinated nerve fibre is enveloped with Schwann cells, which form a myelin sheath around the axon. The myelin sheath is impermeable to ions. As a result, the ionic exchange and depolarization of nerve fibre is not possible along the whole length of the nerve fibre. It takes place only at some point, known as nodes of Ranvier. In non-myelinated nerve fibre, the ionic exchange and depolarization of nerve fibre takes place along the whole length of the nerve fibre because of this ionic exchange, the depolarized area becomes repolarised and the next polarized area becomes depolarized
