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प्रश्न
Differentiate between Myelinated and non-myelinated axons.
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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
Receptor, Spinal cord, Effector, Motor neuron, Sensory neuron.
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Basic structural unit of the nervous system is the________.
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Each neuron consists of three parts called cell body, cyton and axon.
Write the function of medullary sheath.
Define the following:
Axon
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Neurotransmitters are either broken down or reabsorbed after they have conducted an impulse.
Differentiate between:
Rods and Cones.
Identify the odd item from the following series of words.
When the potential across the axon membrane is more negative than the normal resting potential, the neuron is said to be in a state of ______.
The action potential occurs in response to a threshold stimulus; but not at sub-threshold stimuli. What is the name of the principle involved?
Bipolar neurons are found in ______
The structural and functional units of the nervous system is ______.
Which cells are responsible for formation of myelin sheath?
Junction between two neurons is called ____________.
In a neuron, conversion of electrical signal to a chemical signal occurs at/in
The mammalian nervous system uses both electrical and chemical means to send signal via neurons. Which part of the neuron receives impulses?
Rearrange the following in correct sequence pertaining to what is given within brackets at the end.
Axon endings - Dendrites - Axon - Perikaryon - Dendron (Neuron structur)
Name the following:
Three types of neurons
Name the following:
Three main parts of the neuron
Define the following term:
Synaptic cleft
