Question

glucagon and insulin work ______ on blood glucose levels.
multiple choice
○ permissively
○ antagonistically
○ synergistically

Explanation:

To solve this, we analyze the functions of glucagon and insulin:

• Glucagon raises blood glucose levels (e.g., by promoting glycogenolysis).
• Insulin lowers blood glucose levels (e.g., by facilitating glucose uptake into cells).
• "Antagonistically" means two substances act in opposing ways. Since glucagon and insulin have opposite effects on blood glucose, they work antagonistically.
• "Permissively" implies one hormone allows another to act, which is not the case here.
• "Synergistically" means they act together to enhance an effect, but their effects on glucose are opposite, so this is incorrect.

Answer:

B. antagonistically (assuming the second option is labeled B; if the original labels were different, adjust accordingly. Based on the options, the correct one is the "antagonistically" option.)