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प्रश्न
Differentiate between Myelinated and non-myelinated axons.
उत्तर
| Myelinated axons | non-myelinated axons | |
| 1. | Nerve impulse conduction is saltatory. | Nerve impulse conduction is smooth. |
| 2. | Myelinated axon have a myelin sheath. | Myelin sheath is absent. |
| 3. | Node of Ranvier is present between adjacent myelin sheaths. | Node of Ranvier is absent. |
| 4. | Found in the brain, the spinal cord, the cranial and spinal nerves | Found in autonomous and somatic neural systems |
| 5. | Schwann cells are observed inside the myelin sheath | Schwann cells are not observed inside the myelin sheath |
| 6. | Schwann cells in axons generate myelin sheaths. | The myelin sheath is lacking. |
| 7. | Voltage-gated ion channels are concentrated at the nodes, and depolarization only occurs there. | Voltage-gated ion channels are found throughout the axon, and depolarization occurs along the length of the nerve fibre. |
| 8. | Ion exchange can only happen at the nodes. | Ion exchange happens over the surface. |
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संबंधित प्रश्न
Distinguish between Impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre
Receptor, Spinal cord, Effector, Motor neuron, Sensory neuron.
Differentiate between Spinal nerves and Cranial nerves (number of nerves).
The number of Spinal nerves in a human being are :
(A) 31 pairs
(B) 10 pairs
(C) 21 pairs
(D) 30 pairs
Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong:
Dendrites, Medullary sheath, Axon, Spinal cord
Given below is the diagram of a neuron. Name the parts numbered 1-5.
Describe three kinds of nerves, giving the example of each.
State whether the following statement is true (T) or false (F):
There are 31 pairs of cranial nerves.
Define the term Sensory neuron.
Define the term Motor neuron.
Define the term Neuron.
Explain the following term :
Association neuron
Dendrons are the longest fibres that conduct impulses away from the cell body.
The structural and functional units of the nervous system is ______.
Which cells are responsible for formation of myelin sheath?
______ is the gap between the axon of one terminal neuron and the dendrites of next neuron.
Explain the function of the neuron.
Nissl's granules are found in the cytoplasm of ______.
The figure given below is the basic structural and functional unit of the human nervous system. Study the diagram and answer the following questions:
 |
- Write the technical term for the diagram.
- Name two organs of our nervous system where these cells are richly found.
- How are these cells significant for us?
- Name the cell organelle that is absent in these cells and how does it affect our body metabolism?
- Redraw the same figure and label the following Perikaryon, Axon, Dendrites, Myelin sheath and Node of Ranvier.
