Question

what is the basic unit of nervous tissue​

Answer 1

Answer:

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Explanation:

The basic unit of the nervous system is a nerve cell, or neuron. The human brain contains about 100 billion neurons.

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Answer 2

★Question:

what is the basic unit of nervous tissue

★ ⦋Answer⦌:

The basic unit of the nervous system is the "nerve cell," called "neuron." A neuron consists of

(1) The Cell Body that contains the same cellular organelles as do other body cells. The central cell body is the largest part of a neuron and possesses the nucleus, associated cytoplasm, and other cell organelles involved in the cell metabolism. The cell body produces proteins needed for the construction of other organelles of the neuron, and

(2) Nerve Processes that are thin "finger-like" projections originating from the cell body and conduct or transmit signals.

~These processes are of two types: (a) The Axon – that arise from cell hillock (or appear like cell body extension) typically carry signals away from the cell body. They are long nerve processes that may branch out to convey signals to various areas. Some axons are wrapped in an insulating coat of fatty glial cells called oligodendrocytes and Schwann cells. These cells form the myelin sheath which indirectly assists in the relatively faster conduction of impulses as they jump from gap to gap (called Nodes of Ranvier) between the myelin sheath, and (b) Dendrites - typically carry signals toward the cell body. Dendrites are usually more numerous, shorter and more branched than axons. They have many synapses, or junctions in order to receive signals from many nearby neurons.

●Neurons are classified as (i) Motor neurons that carry information from the central nervous system to organs, glands, and muscles, or

(ii) Sensory neurons transmitting information to the central nervous system from internal organs or from external stimuli, and

(iii) Interneurons relaying signals between motor and sensory neurons.

●There are three main classes of neurons. (i) Multipolar neurons are found in the central nervous system and are the most common of the neuron types. These neurons have a single axon and many dendrites extending from the cell body. (ii) Unipolar neurons have one very short process that extends from a single cell body and branches into two processes. Unipolar neurons are found in spinal nerve cell bodies and cranial nerves. (iii) Bipolar neurons are sensory neurons consisting of one axon and one dendrite that extend from the cell body. They are found in retinal cells and olfactory epithelium.

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