In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
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Question: Question: Which system is capable of responding quickly to changing situations? Answer: nervous system

Answer: Nervous system system is capable of responding quickly to changing situations.

Question: Question: Work is done only if a force is exerted in the direction of what? Answer: motion

Answer: Work is done only if a force is exerted in the direction of motion.

Question: Question: What kinds of cells that are important to our physical functioning can atrophy when they are not used? Answer: muscles

Answer:
Muscles kinds of cells that are important to our physical functioning can atrophy when they are not used.