Question

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what happens when the bladder becomes full?
the stretch receptors in the bladder wall send signals to the spinal cord.
the bladder becomes smaller in size.
the bladder stops producing urine.
the bladder starts filtering urine.
the bladder sends signals to the brain instead of the spinal cord.

Explanation:

When the bladder becomes full, stretch receptors in its wall detect the stretch. These receptors send signals to the spinal cord (not the brain initially in the basic reflex pathway). The bladder doesn't produce urine (kidneys do), it stores urine. It doesn't filter urine (kidneys filter blood to form urine). And when full, it doesn't become smaller in size (it's stretched when full).

Answer:

The stretch receptors in the bladder wall send signals to the spinal cord.