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Here are the clues. Preceding each clue is the number of letters in the answer.

Clue 1: 11 letters. mechanism of vapocoolant action
Clue 2: 11 letters. changes in blood flow
Clue 3: 10 letters. mechanism of hot pack thermal action
Clue 4: 10 letters. mechanism of ultrasound thermal action
Clue 5: 9 letters. mechanism of UV action