Experiment: To study reflex action, a subject's knee-jerk response was tested after applying pressure to the thigh nerve.Observation: The reflex was immediate and involuntary.Question: Which conclusion is accurate?
Correct answer: C. Reflexes are fast, involuntary responses bypassing the brain.
- A. All voluntary actions require reflexes.
- B. Reflex arcs begin in the brain.
- C. Reflexes are fast, involuntary responses bypassing the brain.
- D. Pressure slows down reflexes.
Explanation
The correct answer is Option C: Reflexes are fast, involuntary responses bypassing the brain. In the experiment described, the immediate and involuntary knee-jerk response indicates a reflex action, which is a rapid and automatic response that does not involve conscious thought. Reflex arcs bypass the brain to allow for quick responses to stimuli. The other options are incorrect because not all voluntary actions require reflexes, reflex arcs do not begin in the brain, and pressure generally does not slow down reflex responses.
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