GLOSSARY+ABOUT+NUTRITION

As it also involves the removal of waste substances and residual energy, it can be described as an exchange of matter and energy with the environment. || are burnt with the help of the oxygen to produce the energy that the cells need. This process also involves the removal of CO2, H2O, and heat. ||
 * **Nutrition** || Getting the matter and the energy that every living being needs to grow, survive and reproduce.
 * **Breathing** || The **movements performed by the lungs** (along with the rib cage) to inhale and exhale the atmospheric air. ||
 * **Respiration** || The process carried by the **mitochondria**, whereby small energetic nutrients (monosaccharides, fatty acids)

It is performed by the ring-like muscles of the walls of the esophagus, the stomach and the intestines. ||
 * **Peristalsis** || The wavelike muscular contractions of the digestive tract by which its contents are forced to move onwards.
 * **Bolus** || The food mass that crosses the esophagus after having undergone a first digestive stage in the mouth. ||
 * **Chyme** || The fluid food mass that is produced **in the stomach** when the bolus undergoes a second digestive stage. ||
 * **Chyle** || The very fluid food mass that is produced **in the duodenum** (first part of the small intestine)when the chyme undergoes the third digestive stage. ||