Myelinated and Unmyelinated Fibres

Q.

Mention the exact location of Node of Ranvier.

Q. Why myelin sheath is discontinous..?????

Q. In a myelinated neuron, the voltage gated channels are present in the allowing rapid transmission of action potentials.

1. axon terminals
2. nodes of Ranvier
3. cell body
4. synaptic cleft

Q.

After generation of action potential, the recovery process is called _____.

1. Hyperpolarization

2. Repolarisation

3. No change

4. Depolarisation

Q. Amphibians are the first vertebrates to possess a three chambered heart.

1. True
2. False

Q. Which of the following help increase speed of conduction through nerve fibres?

1. Having thicker nerve fibres
2. Myelination around nerve fibres
3. Having unmyelinated nerve fibres.
4. Having impulses jump from one node to another

Q. ___ increases insulation of nerve fibres and increases speed of conduction.

1. Neuronal membrane
2. Non-neuronal cells like astrocytes
3. Membrane proteins
4. Myelin sheath

Q. How do the nerve fibres conduct inpulse to the synapse

Q. Which of the following help increase speed of conduction through nerve fibres?

1. Having thicker nerve fibres
2. Myelination around nerve fibres
3. Having unmyelinated nerve fibres.
4. Having impulses jump from one node to another

Q. In unmyelinated neurons, voltage gated channels are present at regular intervals to ensure that is regenerated at regular intervals.

1. action potential
2. electricity
3. ATP

Q. Bipolar neurons are found in ____________

[Review question: Pg. No: 226]

Q.

Saltatory transmission occurs in

1. Spinal nerve

2. Myelinated fibre

3. Nonmyelinated fibre

4. None of the above