Which statement best describes the pharmacodynamics of insulin? 1. Insulin causes the pancreas to secrete glucose into the bloodstream. 2. Insulin is metabolized by the liver and muscle and excreted...

Which statement best describes the pharmacodynamics of insulin?

1. Insulin causes the pancreas to secrete glucose into the bloodstream.

2. Insulin is metabolized by the liver and muscle and excreted in the urine.

3. Insulin is needed to maintain colloidal osmotic pressure in the bloodstream.

4. Insulin lowers blood glucose by promoting use of glucose in the body cells.