Question

sensory impulses originate at receptors in response to

multiple choice

local changes in their cell membrane potentials
decreasing permeability of nerve cell membranes
subthreshold potential
neurotransmitters

Explanation:

Sensory receptors generate impulses when there are local changes in membrane potential due to stimuli. Decreasing permeability doesn't directly initiate impulses. Sub - threshold potential doesn't trigger an impulse. Neurotransmitters are involved in signal transfer between neurons, not the initial generation at receptors.

Answer:

local changes in their cell membrane potentials