NEET BIOLOGY

HUMAN PHYSIOLOGY

CONTROL AND COORDINATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Four processes occur when impulses cross a synapse. P neurotransmitter diffuses across the gap Q neurotransmitter binds with receptors R impulse stimulates vesicles S release of neurotransmitter What is the correct sequence for these processes?
A
A P
B
B R
C
C R
D
D S
Explanation: 

Detailed explanation-1: -The molecules of neurotransmitter diffuse across the synaptic cleft and bind to receptor proteins on the postsynaptic cell. Activation of postsynaptic receptors leads to the opening or closing of ion channels in the cell membrane.

Detailed explanation-2: -When the nerve impulse reaches the dendrites at the end of the axon, chemical messengers called neurotransmitters are released. These chemicals diffuse across the synapse (the gap between the two neurons). The chemicals bind with receptor molecules on the membrane of the second neuron.

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