Explain Nervous tissue in detail.
Answers
Answer:
Nervous or the nerve tissue is the main tissue of our nervous system. It monitors and regulates the functions of the body. Nervous tissue consists of two cells: nerve cells or neurons and glial cells, which helps transmit nerve impulses and also provides nutrients to neurons. Brain, Spinal Cord, and nerves are composed of nervous tissue, they are specialized for being stimulated to transmit stimulus from one to another part of the body rapidly.
Structure Of Nervous Tissue
It is made of nerve cells or neurons, all of which consists of an axon. Axons are long stem-like projections emerging out of the cell, responsible for communicating with other cells called the Target cells, thereby passing impulses
The main part is the cell body which contains the nucleus, cytoplasm and cell organelles. Extensions of the cell membrane are referred to as processes.
Dendrite is a highly branched processes, responsible for receiving information from other neurons and synapses (specialized point of contact). Information of other neurons is provided by dendrites to connect with its cell body.
Information in a neuron is unidirectional as it passes through neurons from dendrites, across the cell body down the axon.
Nervous Tissue Location
The nerve tissue or the nervous tissue is the chief tissue component of the two major parts of the nervous tissue – Central nervous system(CNS) formed by the spinal cord and the brain and the branching peripheral nerves of the peripheral nervous system (PNS) that control and regulate the functions of the body and their activities.
The nervous tissue is located in the peripheral nerves all through the body and also in the organs of the central nervous system such as the spinal cord and the brain. The nervous tissue consists of the nerve cells or the neurons. Neurons are specialized cells that react to stimuli by generating signals through the axons, which are elongated structures arising from the cell body.Characteristics Of Nervous Tissue
Nervous tissue makes up for the CNS and PNS of the nervous system
Contains two distinct cells – neurons and glial cells
It consists of the dendrites, cell body, axon and nerve endings.
Neurons secrete chemical neurotransmitters which are responsible for stimulating other neurons as a result of a stimuli
Presence of specialization at axonal terminals called synapsis
Nerve cells live long, cannot be divided and replaced(except memory cells)
Function Of Nervous Tissue
Neurons generate and carry out nerve impulses. They produce electrical signals that are transmitted across distances, they do so by secreting chemical neurotransmitters.
Responds to stimuli
Carries out communication and integration
Provides electrical insulations to nerve cells and removes debris
Carries messages from other neurons to the cell body
What is the main function of nervous tissue?
The main function of nervous tissue is to receive stimuli and send signals to the brain and spinal cord. These signals are sent to the muscles via the nerves.
What is a nervous tissue composed of?
A neuron is known as the nervous tissue. It comprises three parts:
Axon
Cell Body
Dendrites
Explanation:
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Nervous Tissue
Cells of nervous tissue are called Nerve Cells or Neurons . Many nerve cells are bounded by connective tissue to make a nervous tissue.
→ Function
Highly specialised tissue that helps in transmitting stimuli from one place to other in body.
Controls all activities of the body.
→ Location
Brain , spinal cord and nerves are made of nervous tissue
→ Structure
Its structure looks like a tree with branches coming out of it .
⇒ A neuron has 3 parts
1) A star shaped body called CYTON which has nucleus and cytoplasm.
2) A single long part called AXON ( carry messages away from cyton).
3) Short branched part called DENDRITES ( carry messages towards cyton ).
