The process of digestion begins in the mouth with chewing and the addition of saliva. The food is now a bolus. The epiglottis protects the windpipe, keeping food in the esophagas where peristalsis moves it down to the stomach.
Digestion breaks down all the food we eat so the important nutrients and molecules can be absorbed into our circulatory system. All of our cells use the nutrients, and as a part of working, create waste that our body systems eliminate. Three very important systems remove waste from our cells. Learn about skin, the respiratory system and why the urinary system is our most important excretory system...
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