Peristaltic movement.
The peristalsis which is a wavelike muscle contraction
peristalsis
It is called deglutition.
Peristalsis is the wavelike motion of muscles that pushes food downward through the digestive tract. It helps propel food and liquids from the esophagus to the stomach and through the intestines for digestion and absorption.
The muscle pushes against the other muscle that does the opposite action. Take the bicep for example the bicep pulls while the tricep also pulls. the two muscles cancel each other out, but while still pulling making the muscle more showing.
Diaphram
smooth muscle pushes food through the intestine and smooth muscle is a involuntary muscle
Food travels down the esophagus or intestines by a muscle movement called "Peristalsis" that constantly pushes the food down into the stomach.
in your mouth. it is a muscle that pushes food in your throat
Smooth muscle surrounding the bladder pushes urine out of the urethra.
An oar pushes the water and the water pushes the oar.
Forces ALWAYS come in pairs - as in "action/reaction". The atmosphere is no exception. For example, if the air pushes an airplane up, then the airplane also pushes the air down.