- Muscles are a part of the body
- The nervous system is used for controlling the body
- Hence, the nervous system can be used for controlling the muscles of the body

- The nervous system can be used for controlling the muscles of the body
- Muscular movement helps animals move
- So, the nervous system can be used to control the muscles of the body to help the body move

- The nervous system can be used to control the muscles of the body to help the body move
- The muscular system contains muscles
- Hence, the nervous system can be used to control the muscular system of the body to help the body move

- A reflex is a kind of action
- Movement is a kind of action
- Therefore, a reflex can be a kind of movement

- The nervous system can be used to control the muscular system of the body to help the body move
- A reflex can be a kind of movement
- So, the nervous system can be used to control the muscular system of the body to cause a reflex

- The nervous system can be used to control the muscular system of the body to cause a reflex
- If two or more systems are used to cause a single action, then those systems work together to cause that action
- Therefore, the muscular and nervous systems working together causes a reflex

Therefore, the muscular and nervous systems working together causes a reflex
Question: A reflex can protect the body from harm. Which organ systems work together to produce a reflex?
Context: - Muscles are a part of the body 
- A reflex is a kind of action 
- Muscular movement helps animals move 
- If two or more systems are used to cause a single action, then those systems work together to cause that action 
- The muscular system contains muscles 
- The nervous system is used for controlling the body 
- Movement is a kind of action