Question

after injuring his knee, kai began having pain and numbness in his lower leg. the doctor said the injury damaged nerves that run all the way down his leg.
kai’s pain and numbness was caused by damage to the
peripheral nervous system
central nervous system
respiratory system
circulatory system
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Explanation:

The peripheral nervous system includes all nerves outside the brain and spinal cord, such as those running through the limbs. Damage to leg nerves (peripheral nerves) causes pain and numbness, matching Kai's symptoms. The central nervous system refers to the brain and spinal cord, while respiratory and circulatory systems are unrelated to nerve-related numbness/pain in the leg.

Answer:

peripheral nervous system