Structure of the Neuronal Soma and Axon

Q. Node of ranvier is the place where

1. myelin sheath and neurilemma are discontinuous
2. axolemma is absent
3. axolemma is discontinuous
4. myelin sheath is discontinuous

Q.

Nerve cell are known as _____.

Q. Which of the following is not strictly considered a part of the neuron?

1. Dendrites
2. Myelin sheath
3. Nissl’s granules
4. Synaptic knob

Q. Nissl’s granules present in the neurons are made up of:

1. RNA
2. RER
3. Ribosomes
4. Both b and c are correct

Q.

Which of the following is the basic unit of nervous tissue?

1. Neuron

2. Nephron

3. Muscle cells

4. Blood cells

Q.

Identify the parts labelled I to IV.

1. Dendrites, Soma, Axon, Axon Terminals

2. Soma, Dendrites, Axon Terminals, Axon

3. Axon, Axon Terminals, Dendrites, Soma

4. Axon Terminals, Axon, Soma, Dendrites

Q.

Define neuron.

Q. produce myelin for the neurons in the central nervous system and produce myelin for nerves in the peripheral nervous system.

1. Oligodendrocytes
2. Astrocytes
3. Schwann cells
4. Neuron

Q. Identify the parts of neuron.

1. X- Cell body, Y- Node of Ranvier, M- Synaptic knob, S- Dendrites, A- Nucleus, H- Axon, V- Myelin sheath
2. X- Cyton, Y- Node of Ranvier, M- Synaptic knob, S- Dendrites, A- Nucleus, H- Axon, V- Schwann cell
3. X- Cell body, Y- Node of Ranvier, M-Dendrites, S-Synaptic knob, A- Nucleus, H- Axon, V- Medullary sheath
4. X- Cell body, Y- Node of Ranvier, M- Synaptic knob, S- Dendrites, A- Nucleus, H- Axon, V- Myelin sheath

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

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

Q. Which of the following is absent in neurons?

1. Neurilemma
2. Sarcolemma
3. Myelin sheath
4. Axolemma

Q. Choose the correct statement(s) for axon of a neuron:

1. Myelin sheath in humans is an alternative to a thick axon in giant squid.
2. In CNS, myelin is produced by schwann cells.
3. Nodes of Ranvier are booster sites for transmission of electrical signals.
4. Smaller axons are often not myelinated.