Function of nervous tissues
Answers
Nervous tissue makes up the nervous system. The nervous system is subdivided in several overlapping ways. The central nervous system (CNS) is composed of the brain and spinal cord, which coordinates information from all areas of the body and sends nerve impulses that control all bodily movements. The peripheral nervous system (PNS) consists of peripheral nerves that branch all throughout the body. It connects the CNS to the rest of the body and is directly responsible for controlling movements of specific parts of the body; for example, just before arm movement the CNS sends nerve impulses to the PNS nerves in the arm, which causes the arm to move.
Another subdivision of the nervous system is into the sympathetic nervous system (SNS) and the parasympathetic nervous system (PSNS). The SNS activates in order to stimulate a fight-or-flight response in an organism when that organism encounters a threat and must decide whether to fight or flee from it. The nerves of the SNS have diverse effects on different parts of the body. Activation of the SNS causes the pupils of the eyes to dilate, inhibits digestion, increases sweat secretion, and increases the heart rate. Conversely, the PSNS is activated during moments of “rest and digest”, when an organism is not facing an immediate threat. Nerves of the PSNS work to stimulate activities that can occur at rest such as digestion, waste excretion, and sexual arousal, and they also decrease the heart rate.
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Functions of Nervous Tissue:-
◇ Sensation :- The tissues picks up sensations of all types like sight, sound, smell, taste, touch , pain, and other stimuli.
◇ Responses :- Nervous system provides responses to all types of stimuli.
◇ Control :- it exerts control over all body activities.
◇ Coordinate :- nervous system coordinates the functioning of different body organs.
◇ Learned Behaviour :- Intelligence, Behaviour, Memory, Reasoning.