Class 8 Nervous System Question Answers
Fill in the blanks:
- A sense organ or receptor is an organ that receives external ……….
- Nervous tissue is composed of ……. cells or ………
- ………… is the basic unit of the nervous system.
- The main part of a neuron consists of ………… and ……………
- Neurons have protoplasmic outgrowths called …………….
- Sheathed …………. are called nerve fibers.
- …………… are the interconnections or junctions between neurons.
Answers
- Stimuli
- Nerve cells and neurons
- Neuron
- Cytoplasm and nucleus
- Dendrites
- Axons
- Synapses
Define the following terms.
- Effector –
- The term effector refers to an organ, tissue, or cell that responds to a stimulus by working or producing a substance.
- Conduction –
- The process by which information is transmitted or excited is called conduction.
- Impulse –
- An impulse is a wave of electric discharge conducted by nerves.
- Response –
- Response is a change in reaction brought about by a stimulus in an organism.
- Axon –
- A neuron’s axon is a fiber-like process that conducts impulses away from the cell body.
