Myelinated and Unmyelinated Fibres

Q.

Where are unmyelinated nerve fibres found?

Q. The myelin sheath around axon is formed by:

1. Nodes of ranvier
2. Synaptic knob
3. Schwann cells
4. Both b and c

Q. Choose the correct statement(s) about impulse transmission in a neuron:

1. Voltage gated ion channels present at regular intervals in unmyelinated neuron ensure impulse transmission.
2. Myelinated neurons have myelin allows the movement of ions at a fast pace resulting in faster signal transmission.
3. Nodes of Ranvier are breaks in myelin sheath and voltage gated channels are clustered here.

Q. Myelin sheath is produced by:

1. Schwann cells and oligodendrocytes
2. astrocytes and Schwann cells
3. oligodendrocytes and osteoclasts
4. osteoclasts and astrocytes

Q. Where can you find nodes of Ranvier?

1. on an axon
2. in the cell body
3. on a dendrite
4. both a and c

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