Question

Look at the diagrams modeling some of the body systems.


Which pair of diagrams must be included in a model explaining why a hand pulls back suddenly from a hot flame?

Responses

1 and 2

1 and 2

1 and 3

1 and 3

3 and 4

3 and 4

2 and 4

2 and 4
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Answer 1

1 and 3

The nervous system (detects the heat and sends a rapid signal) and the muscular system (contracts the muscle to pull the hand away) are both required to explain the reflex.