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.

Assertion   :       Non-myelinated nerve fibres do not possess nodes of Ranvier.

Reason      :       This is due to the absence of nissl’s bodies in node of Ranvier.