CENTRAL NERVOUS SYSTEM-SBAQ

What type of glial cell provides myelin for the axons in a tract?

• Oligodendrocyte

• Astrocyte

• Schwann cell

• Satellite cell

Which part of a neuron contains the nucleus

• Dendrite

• Soma

• Axon

• Synaptic end bulb

Which of the following substances is least able to cross the blood-brain barrier?

• Water

• Sodium ions

• Glucose

• White blood cells

All this neurons are multipolar except for

• Motor neuron

• Pyramidal neuron

• Olfactory neuron

• Purkinje neuron

Vertigo :-

• is a post-rotational sense of being rotated toward opposite side of original rotation

• is a post-rotational sense of being rotated toward same side of original rotation

• is a rotational sense of being rotated toward opposite side of original rotation

• is a rotational sense of being rotated toward same side of original rotation

Which of the following structures is a part of the rhombencephalon?

• Temporal lobe

• Thalamus

• Substantia nigra

• Medulla

Which of these is not a feature of postganglionic neurons in the sympathetic nervous system?

• Originating distal to the effector organ

• Unmyelinated

• Short

• Noradrenergic

Acetylcholine is synthesised and packaged in the presynaptic terminal before being released to act on the postsynaptic receptors. Which of these statements about that process in parasympathetic postganglionic neurons is not true?

• Acetylcholine is synthesised by the action of choline-o-acetyltransferase on choline and acetyl coenzyme A.

• Release of neurotransmitter is triggered when voltage sensitive calcium channels open to allow the influx of calcium

• The released acetylcholine acts on postsynaptic nicotinic receptors

• Choline is recycled by being taken back up into the presynaptic terminal

Which of the following describes salbutamol, a β₂-adrenoceptor agonists

• Direct acting sympathomimetic

• Indirect acting sympathomimetic

• Direct acting parasympathomimetic

• Indirect acting parasympathomimetic.

Activation of the sympathetic nervous system leads to the 'fight and flight' response. Which of these is not part of that process

• Vasodilatation in skeletal muscle

• Sweating

• Bladder relaxation

• Increased gut motility