IF dopaine is not removed from the synaptic cleft, what do you
think happens?

State of excitation or stimulation will keep on progressing.

Explanation:

IF dopaine is a type of neurotransmitter that is released from the nerve ending upon excitation and stimulation.

This neurotransmitter need to be removed when the work is done else the state of excitation or stimulation will keep on progressing or will be in continuous state of excitation thereby causing neural harm.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.