Class 9th – Nervous tissue

• The nervous tissue comprises of brain, spinal cord and nerves.
• Structural and functional unit of nervous system is NEURON.
• Cells of nervous tissue are highly specialized for stimulation.
• It is responsible for coordinating and controlling.

NEURONS

• A neuron consists of cell body, nucleus within the cell body and cytoplasm.
• The long part of neuron is called AXON.
• Many short branches arise from the neuron called DENDRITES.
• It consists of myelinated sheath for conduction of message.  
• The message can be in the form of chemicals or electric impulses.

FUNCTIONS OF NERVOUS TISSUE:

• Helps in communication
• Control and coordination.
• Respond to stimuli
• To think and act