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Central Nervous System

The term "gre...

Question

The term "grey matter" refers to

A

neurons that are unmyelinated

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B

axons that are myelinated

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C

dendrites that are myelinated

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D

neurons that are myelinated

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Solution

The correct option is A neurons that are unmyelinated
The grey matter is mainly composed of neuronal cell bodies and unmyelinated axons. In the grey matter, these axons are mainly unmyelinated, meaning they are not covered by a whitish-coloured, fatty protein called myelin. The grey matter serves to process information in the brain.

So, the correct answer is 'neurons that are unmyelinated'.

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Similar questions

Myelinated neurons are called as grey matter and non-myelinated neurons are called as white matter.

Q. Which of the following statements are correct and incorrect?
1. Synaptic cleft of neurons secrete adrenaline.
2. Myelinated nerve fibres are enveloped with Schwann cells, that form a myelin sheath around the axon.
3. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
4. Spinal cord and cranial nerves are made of non-myelinated nerve fibres.

Out of the four statements.

Q. The neurons in the brain are myelinated by

Q. Which of the following statements are incorrect?
(i) When an impulse travels along a myelinated neuron, it leaps over the myelin sheath from one node to the next.
(ii) At chemical synapse there is continuity between the presynaptic and postsynaptic neurons provided by the gap junctions.
(iii) Neurotransmitters are chemicals that are released from postsynaptic neuron which interact with specific receptors of presynaptic neuron.
(iv) Neurons releasing acetylcholine are described as cholinergic neurons and those releasing noradrenaline are described as adrenergic neurons.
(v) Refractory period is the period after the transmission of an impulse in a nerve fibre in which membrane of the axon regains its ability to transit impulses.

Q. Name two things that are matter and two that are not matter?

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