Question

Put the sensory transduction events in the proper order

___ Stimulus binds/stimulates sensory receptor

___ Action potentials travel along the sensory neuron towards the CNS

___ Neurotransmitter binds to a ligand-gated channel in the sensory nerve

___ Synaptic vesicles within the receptor release a neurotransmitter

___ A local potential is created in the sensory nerve

___ A receptor potential is created in the sensory receptor

Answer 1

Sensory transduction events - are a series of events that convert external stimuli into electric activity

Correct order is

1. Stimulus binds/ stimulates the sensory receptor
2. A receptor potential is created in the sensory receptor
   • Open Na channels, this causes an influx of Na+
   • The leads to the development of receptor potential
   • It is graded, that means, greater the stimulus, greater will be the receptor potential
3. Synaptic vesicles within the receptor release a neurotransmitter
   • When the receptor potential reaches a threshold, the synaptic vesicles bind to the plasma membrane. this releases the neurotransmitter
4. Neurotransmitter bind to the ligand-gated channel in the sensory nerve
   • The neurotransmitter released by the receptors activates the ligand-gated channel on the sensory nerve.
5. A local potential is created in the sensory nerve
   • When the ligand-gated channels are activated, generate an action potential, this stimulates, other sodium channels to get activated. This leads to the propagation of the action potential.
6. Action potential travel along the nerve to the CNS
   • In the CNS, the sensory input is analyzed and interpreted.