Go to this link it shows you everything. http://npic.orst.edu/health/child.html
Answer:
Peristalsis is also part of mechanical digestion. This refers to involuntary contractions and relaxations of the muscles of your esophagus, stomach, and intestines to break down food and move it through your digestive system.
Explanation:
Physical, mental, and social are the three focuses of health. Also known as the health triangle