Question

b. the model shows the role of only one of the body systems involved in the reflex.
c. the leg in the model moves much more quickly than a real person’s leg.
d. the model does not completely model the path of the nerve signal through the nervous system.
part b
choose the evidence that best supports the answer to part a.
a. the model does not include a brain for processing.
b. the stimulus causes the leg in the model to move almost immediately.
c. the stimulus is not applied directly to the mechanism that moves the leg in the model.
d. the signal does not pass through a part of the model that represents the spinal cord.

Explanation:

To solve this, we assume Part A's answer relates to the model's incomplete representation of the nervous system (e.g., option D in Part A). For Part B, we analyze each option:

• Option A: A brain isn’t needed for a reflex (spinal reflex), so this doesn’t support.
• Option B: Speed of movement doesn’t relate to incomplete nerve signal modeling.
• Option C: Stimulus application method isn’t about nerve signal path.
• Option D: If the model lacks a spinal cord representation for signal passage, it directly shows the model doesn’t fully model the nerve signal path (supporting Part A’s answer about incomplete nerve signal modeling).

Answer:

D. The signal does not pass through a part of the model that represents the spinal cord.