Place three mini marshmallows in a syringe. Push the plunger down just until it touches the top of the marshmallows. Put your finger over the tip of the syringe to form a seal. Pull up on the plunger. What happens to the marshmallows? What is being decreased inside the syringe? What is being increased?

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

the answer is d.) potassium