My Notes
Nervous tissue is made up of neurons and neuroglial cells. Point out which of the following statement about these two cells is false:
| I. | Neuroglia make up more than one-half the volume of neural tissue in our body |
| II. | Neuroglia protect and support neurons |
| III. | When a neuron is suitably stimulated, an electrical disturbance is generated which swiftly travels along its cytosol |
| IV. | This disturbance at the neuron endings triggers stimulation or inhibition of adjacent neurons or other cells |
1. Only I and IV
2. Only II and III
3. Only III
4. Only IV
The cells other than neurons which make up more than one-half the volume of neural tissue in our body are :
(1) Axon
(2) Liver
(3) Neuroglial cell
(4) Dendrite
Which cell among the following exist in separate structures and is not present in layered form?
(1) Compound epithelial cells
(2) Smooth muscle cells
(3) Nerve cells
(4) Exocrine gland cells
Assertion : Neurons are said to possess the property of excitability.
Reason : Neurons can get excited by a given stimulus.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Non-myelinated nerve fibres do not possess nodes of Ranvier. |
| Reason (R): | This is due to the absence of nissl’s bodies in node of Ranvier. |
In light of the above statement, choose the most appropriate answer from the options given below:
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
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