Structure of the Neuronal Soma and Axon

Q. Select the incorrect statement regarding synapses:

1. Electrical current can flow directly from one neuron into the other across the electrical synapse
2. Impulse transmission across a chemical synapse is always faster than the across an electrical synapse
3. The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse
4. Chemical synapses use neurotransmitters

Q. Axon transmits impulse ________ cell body and dendrites transmit impulse ________ cell body.

1. away from, towards
2. towards, away from
3. away from, away from
4. towards, towards

Q.

Where are Nissls granules found? What is their function?

Q.

The message is any signal that triggers the response of a_____.

1. Receiver

2. Sender

3. Driver

4. Cleaner

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

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

Q.

State the location and functions of the parts given below

Cyton

Q.

Pick out the odd one out with a reason.

Axon, receptor, dendron, cyton.

Q.

Cells of Schwann are associated with ___ .

Nervous tissue

Cartilage tissue

Connective tissue

Muscular tissue

Q. Node of Ranvier is present over

1. dendrite
2. axon
3. synapse
4. cell body

Q. (v) The gaps between two adjacent myelin sheaths are called ...........

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.

Where neurolemma is found?

Q. Axon transmits impulse ________ cell body and dendrites transmit impulse ________ cell body.

1. away from, towards
2. towards, away from
3. away from, away from
4. towards, towards

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.

Nissl granules are formed from

1. RER

2. SER

3. DNA

4. Golgi bodies

Q. What used to be described as Nissl granules in a nerve cell are now identified as?

1. Fat granules
2. Ribosomes
3. Mitochondria
4. Cell metabolites

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.

Q.

What is the name of sheath of nerve fibre?

Q. Identify the statements as true/false. (i) Nodes of Ranvier is absent in nonmyelinatedneuron.

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.

Small, fine hair-like extensions in a neuron is called

1. cell body

2. dendrites

3. axon

4. nerves

Q. Palade granules are

1. Glycoprotein particles
2. Pigment granules
3. Excretory vesicles
4. Ribosomes

Q. How many types of neurons are there?

Q.

Which of the following is true about neurolemma?

1. The cell membrane around the nerve cell

2. A layer of fatty substance around axon

3. A layer of specialised neuroglia around myelin sheath of nerve fibres

4. The connective tissue around a nerve tract

Q.

Rearrange the following in the correct order of involvement in electrical impulse movement.

Cell body, Axon terminal, Dendrites, Axon, Synaptic knob

Q. Nissl bodies are mainly composed of

1. Nucleic acids and SER
2. DNA and RNA
3. Proteins and lipids
4. Free ribosomes and RER

Q. Draw a well-labelled diagram of a neuron and mark the following parts​
(i) Node of Ranvier​
(ii) Nissl granules​
(iii) Cyton

Q. Label the parts of a neuron.

1. Cell body
2. Dendrites
3. Nodes of Ranvier
4. Axon terminal

Q. Most of the neurons in our body are .

1. multipolar
2. bipolar
3. unipolar
4. neuroglia

Q.

In nerve cells, E.R. forms:

1. Myeloid bodies

2. Neurotubules

3. Nissls granules

4. Neurofilaments