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Everybody Poops An introduction to your digestive system Functions of the Digestive System • Breaks down food molecules the body can use. • Molecules are absorbed into blood and carried through the body. • Eliminates wastes. Two Types of Digestion • Mechanical • Food is physically broken down into smaller pieces. • Chewing • Chemical • Chemicals made by your body break down foods. • Stomach acids and enzymes Your Digestive System • It is about 9 meters long from beginning to end. • You make 1 to 3 pints of saliva per day! • The average male will eat about 50 tons of food during his lifetime in order to sustain a weight of 150 lbs • Does it really take 7 years to digest chewing gum? Where does the food go? • • • • Mouth Esophagus Stomach Small Intestine • Large Intestine • Out of the anus through the rectum. Mouth • Mechanical Digestion • Chewing • Chemical Digestion • Saliva Esophagus • Muscular Tube • Connects mouth and stomach. • Food stays for only 10 seconds. • Food moves by peristalsis • Involuntary waves of muscle contraction. Stomach • A J-shaped muscular pouch • It expands as you eat • Average adult volume: 2 liters • Mechanical digestion • Churning • Chemical digestion • Digestive juices • Hydrochloric acid Small Intestine • About 6 meters long (22ft) • Most chemical digestion occurs. • Most absorbtion of nutrients. Large Intestine • The last section • About 1.5 meters long (bathtub) • Water absorbed into blood • Other waste readied for elimination. • Ends at the rectum • Material is compressed into solid form. Other Organs • Liver • Produces bile • A chemical that aids in digestion • Pancreas • Produces digestive enzymes mouth Review esophagus stomach • Digestive Order large intestine small intestine rectum Review • What kind(s) of digestion are utilized by the mouth? The stomach? • About how long is the small intestine? • Where does the most absorption of nutrients occur? • Where is the waste readied for elimination? • About how long is your digestive system?