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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
Draw a labelled diagram of the following:
Brain
Differentiate between Spinal nerves and Cranial nerves (number of nerves).
Name the following :
The layer of the eyeball that forms the transparent Cornea
Fill in the blank:
The neurons carrying impulses from the brain to the muscles are called _______________________.
State whether the following statement is true (T) or false (F).
A double chain of ganglia, one on each side of the nerve cord belongs to the spinal cord.
Explain the following term :
Motor nerve
Draw a labeled diagram of a myelinated neuron.
Compare and contrast.
Sympathetic Nervous System and Parasympathetic Nervous System
All of the following are associated with the myeline sheath except
______ carries the impulse towards the cell body.
The structural and functional units of the nervous system is ______.
Axons ____________.
______ is the gap between the axon of one terminal neuron and the dendrites of next neuron.
Which part of a nerve cell contains a nucleus?
Each branch of the axon terminates as a bulb-like structure called ______
Write one word for the following:
A bundle of axons enclosed in a tubular sheath.
The basic structural and functional unit of brain is ______.
Define the following term:
Synaptic cleft
Give reason:
Neurotransmitters are broken down by an enzyme just after passing an impulse from one neuron to the other.
