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Which one of the following functions is correct for the microglia cells in the brain? (1) Myelin formation (2) Making blood-brain barrier (3) Scavenging injured cell debris (4) Enveloping synapses […]

There is small gap between two neuron at synapses. The purpose of gap is (1) Unidirectional flow of information (2) Reabsorbtion of neurotransmitter (3) Coupling of charge over membrane (4) […]

10. Action potential is fired after threshold stimulus but once the nerve impulse there is the interval of time during which a second action potential cannot be initiated, no matter […]

In brain meninges are absent at (1) Dura mater (2) Pia mater (3) Grey mater (4) Arachnoid mater   Introduction Meninges are the three protective membranes that envelop the brain […]

If neurons are like electrical wire. Then the function of myelin sheath would be like (1) Insulator (2) Charge conductor (3) Charge breaker (4) Charge dissipator   Introduction Neurons transmit […]

Which statement is not correct for nerve impulse transmission? (1) Minimum threshold neurotransmitter concentration is required (2) Threshold number of Na+ channel must be open (3) Amplitude is directly proportional […]

Maximum density of dopamine and nor-adregenic receptor occurs at (1) Cerebellum (2) Cerebellem (3) Medulla oblongata (4) Spinal cord   Introduction Dopamine and noradrenaline (norepinephrine) are key catecholamine neurotransmitters involved […]

Nerves are connected to each other by (1) hormone (2) neurotransmitter (3) bones (4) muscles   Introduction The human nervous system is a sophisticated network of billions of neurons, each […]

A nerve impulse is the electric signals that pass along the dendrites to generate a nerve impulse or an action potential. Transfer of impulse across the nerve fibres is not […]

There is always unidirectional flow of nerve impulse because- (1) Chemical synapsis (2) Myelin sheath (3) Interneurons (4) Membrane polarity   Introduction Nerve impulses—action potentials—always travel in a single direction […]