nervous and respiratory systems digestive and endocrine systems muscular and immune systems skeletal and cardiac systems
I gave my students this multiple choice question: Which two body systems maintain the level of glucose in the blood?

Only one answer is correct among these 4 choices:
- nervous and respiratory systems
- digestive and endocrine systems
- muscular and immune systems
- skeletal and cardiac systems

Could you tell me which one is correct?

digestive and endocrine systems