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I think it might be d. the lungs expand and contract which increases the rate of blood flow so the muscles can convert and store energy
You have to do your own goal
Answer:
Insulin
Explanation:
Insulin and glucagon are hormones secreted by islet cells within the pancreas. They are both secreted in response to blood sugar levels, but in opposite fashion! Insulin is normally secreted by the beta cells (a type of islet cell) of the pancreas.