 Your need a lot of energy for daily activities.  Cells use, which are substances in food, for energy, growth, maintenance, and repair.  The system breaks down the food you eat into nutrients that can be used as building materials and that can provide for cells.

 is the process of breaking down food into a form that can pass from the digestive system into the bloodstream.  There are two types of digestion: and.

 Mechanical Digestion  Is the, crushing, and of food.  Ex: Chewing is a type of mechanical digestion. Chewing creates small pieces of food that are easier to swallow and digest than large pieces are.

 Chemical Digestion  Is the process in which molecules of food are broken down into molecules so that they can pass into the bloodstream.  An is a chemical that the body uses to break down large molecules into smaller molecules.  Enzymes act like chemical scissors, they “ ” large molecules into smaller pieces. *Without mechanical digestion, chemical digestion would take days instead of hours*

 In your mouth, teeth grind food  mechanical  chemical  In the small intestine, most nutrients are broken down by enzymes  mechanical  chemical

 The  The Esophagus   Small Intestine  Intestine

 The Mouth  Digestion begins in the with both mechanical and chemical digestion.  Teeth, with the help of the jaw, and crush food.  As you chew, food is moistened by.  Saliva contains many, including an enzyme that begins the chemical digestion of starches in food.

 The Esophagus  Once food has been chewed, it is and moves through the and a long tube called the esophagus.  of muscle contractions move food into the stomach. Ex: muscle moves food along the same way you move toothpaste from the bottom of the tube with your thumbs

 Stomach  The stomach is a bag that crushes food and contains acids and enzymes for killing and breaking down protein.  The stomach wall contains of muscle so the stomach can and mix food.  This is the step of mechanical digestion.  Food sits in the stomach for a few hours before moving to…..

 Small Intestine  The small intestine is a muscular tube were most digestion takes place.  Most nutrients are in the small intestine as well.  Food travels from the stomach into the small intestine in the form of.  is food reduced to a soupy mixture

 Large Intestine  After food moves through the small intestine, it moves to the intestine.  In the large intestine, and nutrients are absorbed.  Most solid material that remains is.  Waste is and stored until the body eventually eliminates it.

Small IntestineLarge Intestine  After nutrients are down, they are absorbed into the stream and used by cells  Removes from mostly-digested foods, absorbs vitamins, and turns waste into semi-solid waste.

 -makes fluids that break down every type of material found in foods Ex: these include proteins, carbohydrates, fats, and nucleic acids  -makes and releases a mixture called that is stored in the gall bladder ◦ Bile breaks up large fat droplets into very small fat droplets

 HOW LONG ARE YOUR INTESTINES? At least feet in an adult. Be glad you're not a full-grown horse -- their coiled-up intestines are feet long!  Chewing food takes from seconds  Swallowing takes about seconds  Food sloshing in the stomach can last hours

 It takes 3 hours for food to move through the intestine  Food drying up and hanging out in the large intestine can last to !  Americans eat about 700 million pounds of peanut butter.  Americans eat over 2 pounds of chocolate a year.  In your lifetime, your system may handle about 50 tons!!

 ms/digestivesystem/ ms/digestivesystem/