Several of the events that occurred between the time that a physician struck a patient's patellar tendon with a rubber hammer and the time the quadriceps femoris contracted (knee-jerk reflex) are listed below:
1. increased frequency of action potentials in sensory neurons
2. stretch of the muscle spindles
3. increased frequency of action potentials in the alpha motor neurons
4. stretch of the quadriceps femoris
5. contraction of the quadriceps femoris
Which of these lists most closely describes the sequence of events as they normally occur?
A) 4,1,2,3,5
B) 4,1,3,2,5
C) 1,4,3,2,5
D) 4,2,1,3,5
E) 4,2,3,1,5
Answer: D) 4,2,1,3,5
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