Final answer:
Involuntary motion includes tremors, peristalsis, and heartbeats, all of which occur without conscious control and are essential for bodily functions such as digestion and blood circulation.
Step-by-step explanation:
An involuntary motion is one that occurs without conscious control. Examples of involuntary motions include tremors, which are unintentional, often rhythmic movements that can affect various parts of the body; peristalsis, which refers to the rapid, involuntary, wave-like contractions of smooth muscles that push food through the gastrointestinal tract; and heartbeats, which are controlled by cardiac muscle that contracts together to push blood throughout the body. These motions happen without our conscious effort or control, playing critical roles in our body's functioning—peristalsis moves food and waste through our digestive system, and heartbeats regulate the flow of blood in our arteries by contraction.