NEET BIOLOGY

Detailed explanation-1: -Center: electrical transmission occurs via intercellular channels that provide a pathway of low resistance for the spread of currents between cells which are known as “gap junctions .” The currents underlying a presynaptic action potential generate a coupling potential in the postsynaptic cell (coupling).

Detailed explanation-2: -The nervous system is made up of nerves. A nerve is a bundle of nerve cells. A nerve cell that carries messages is called a neuron (Figure below). The messages carried by neurons are called nerve impulses. Nerve impulses can travel very quickly because they are electrical impulses.

Detailed explanation-3: -Animals communicate using signals, which can include visual; auditory, or sound-based; chemical, involving pheromones; or tactile, touch-based, cues.

Detailed explanation-4: -Although the nervous system is very complex, nervous tissue consists of just two basic types of nerve cells: neurons and glial cells. Neurons are the structural and functional units of the nervous system. They transmit electrical signals, called nerve impulses.

Detailed explanation-5: -First, within cells, electrical signals are conveyed along the cell membrane. Second, for communication between cells, the electrical signals generally are converted into chemical signals conveyed by small messenger molecules called neurotransmitters.