Question

1. Neurilemma is absent in:

i. Cranial nerves

ii. Spinal nerves

iii. Autonomic nerves

iv. Brain


2. Nissil granule present in :

1. Dendron

2. Axon

3. Cyton

4. More than one correct


3. Which one of the following has white matter outside and

grey matter inside?

1. Cerebrum

2. Cerebellum

3. Pons

4. More than one correct


4 . Neuron does not show :

1. Sensitivity

2. Conductivity

3. Excitability

4. Contractility


5. Chemical coordination is ………… and ……….. :

1. Fast, wide spread

2. Slow, wide spread

3. Slow, specific

4. Fast, specific

Answer 1

Answer:

1 ans is spinal nerves

2ans is cyton

3ans is

Answer 2

The correct answers to the following questions are:

1. Neurilemma is absent in the iv. Brain.
2. Nissil granules are present in iv. More than one is correct.
3. iii. Pons has white matter on the outside and grey matter on the inside.
4. Neuron does not show iv. Contractility.
5. Chemical coordination is i. Fast and specific.

• Neurilemma is the outermost layer that forms over the myelin sheath. Neurilemma constitutes the cytoplasm and Schwann cell's nuclei. The neurilemma is absent in the entire Central Nervous System. Hence. the correct answer here will be Brain (which is a part of the CNS).
  
• Nissil granules are present in the cytoplasm (also termed as a Cyton) of the neuron. The cytoplasm extends within the dendrons as well. Nissil granules are absent in axons of a neuron. Hence the answer will be more than one correct.
  
• Both cerebrum and cerebellum have grey matter on the outside and the white matter is present in the core. Only Pons and Medulla Oblongata have the grey matter present in the core and the white matter on the outer side.
  
• Neurons engage in conductivity by increasing excitability through potential differences. Neurons are sensitive but are not contractile in nature.
  
• Chemical coordination is not slow. It is fast and the hormones act on a specific target.

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