Receptor potential initiated by an adequate stimulus:- a- develops always at it full magnitudesb- undergoes temporal summation onlyc- undergoes spatial summation onlyd- could initiate an action potential

The correct answer is d- could initiate an action potential.

Here's why:

a- Receptor potential does not always develop at its full magnitude. The magnitude of the receptor potential can vary depending on the strength of the stimulus.

b- Receptor potential does not undergo temporal summation only. Temporal summation is the process where multiple stimuli occurring close in time can add up to produce a larger response. However, receptor potentials can also undergo spatial summation.

c- Similarly, receptor potential does not undergo spatial summation only. Spatial summation is the process where multiple stimuli occurring at different locations can add up to produce a larger response. But as mentioned above, receptor potentials can also undergo temporal summation.

d- Receptor potential could initiate an action potential. This is true because if the receptor potential reaches the threshold level, it can trigger an action potential. The action potential is an all-or-nothing response that propagates along the neuron and ultimately leads to the release of neurotransmitters.