Questions: Question 19 Which statement explains the antagonist relationship of insulin and glucagon? Insulin increases blood glucose and glucagon decreases it. Insulin increases blood volume and glucagon decreases it. Insulin decreases blood glucose and glucagon increases it. Insulin decreases blood volume and glucagon increases it. Confident Not Sure

The answer is the third one: Insulin decreases blood glucose and glucagon increases it.

Explanation for each option:

1. Insulin increases blood glucose and glucagon decreases it.

   • This statement is incorrect. Insulin actually decreases blood glucose levels by facilitating the uptake of glucose into cells, while glucagon increases blood glucose levels by promoting the release of glucose from the liver.

2. Insulin increases blood volume and glucagon decreases it.

   • This statement is incorrect. Insulin and glucagon primarily regulate blood glucose levels, not blood volume.

3. Insulin decreases blood glucose and glucagon increases it.

   • This statement is correct. Insulin lowers blood glucose levels by promoting the uptake of glucose into cells and storage as glycogen in the liver. Glucagon raises blood glucose levels by stimulating the conversion of glycogen to glucose in the liver.

4. Insulin decreases blood volume and glucagon increases it.

   • This statement is incorrect. Insulin and glucagon do not have direct roles in regulating blood volume.

Summary: Insulin and glucagon have an antagonistic relationship in regulating blood glucose levels. Insulin decreases blood glucose, while glucagon increases it.