Nervous-TissueNCERTClass9BiologyScience.pptx

1. 🧠 Nervous Tissue Nervous tissue is the key component of the nervous system, which includes the brain, spinal cord, and nerves.

2. I. Specialization and Function Primary Role Cells of the nervous tissue are highly specialized for being stimulated and then transmitting the stimulus very rapidly from one place to another within the body. The Signal The signal that travels along the nerve fibre is called a nerve impulse . Coordination The functional combination of nerve and muscle tissue is fundamental to most animals, enabling them to move rapidly in response to stimuli. II. The Neuron (Nerve Cell) The structural and functional unit of the nervous tissue is the neuron (or nerve cell). An individual nerve cell can be up to a meter long. A neuron consists of three main parts: Part Description & Function Cell Body (Cyton) The central part containing the nucleus and cytoplasm . Dendrites Many short, highly branched processes that receive the nerve impulse and transmit it toward the cell body. Axon A single, long, thin, fibre-like process that transmits the nerve impulse away from the cell body toward the nerve ending.

3. III. Formation of a Nerve A nerve is formed when many nerve fibres (axons) are bound together by connective tissue. The nerve impulse is transmitted from the nerve endings of one neuron to the dendrites of the next neuron, forming a chain that conducts signals throughout the body.

4. Thank You Understanding nervous tissue is fundamental to comprehending how our bodies coordinate and respond to the world around us.