Final answer:
Smooth muscle is responsible for moving contents through hollow organs. It contracts to propel substances like food, urine, and blood through the stomach, intestines, urinary bladder, and blood vessels.
Step-by-step explanation:
Smooth muscle is the type of muscle that moves contents through hollow organs. It is found in the walls of organs such as the stomach, intestines, urinary bladder, and blood vessels. When smooth muscle contracts, it helps propel substances like food, urine, and blood through these organs. Unlike skeletal muscle, smooth muscle contractions are involuntary and not under conscious control.