Digestive SystemDigestive System

Complex job of moving and breaking Complex job of moving and breaking down fooddown food

The body needs energy The body needs energy and materialsand materials

NutrientsNutrients Important substances that enable the body to move, grow, and Important substances that enable the body to move, grow, and

maintain homeostasis.maintain homeostasis. Protein – used for growth and repairProtein – used for growth and repair Carbohydrates-provide energyCarbohydrates-provide energy Fats-stores energyFats-stores energy Water-helps carry out chemical processesWater-helps carry out chemical processes

Digestive SystemDigestive System DigestionDigestion

The process of breaking down food in The process of breaking down food in smaller substances that your body can use. smaller substances that your body can use.

Two types of DigestionTwo types of Digestion Mechanical DigestionMechanical Digestion

Physical or mechanical changes Physical or mechanical changes Usually breaking the food into smaller piecesUsually breaking the food into smaller pieces ChewingChewing Stomach mashing and poundingStomach mashing and pounding PeristalsisPeristalsis

Wavelike contractions of smooth muscle tissue in your Wavelike contractions of smooth muscle tissue in your digestive systemdigestive system

Chemical DigestionChemical Digestion Breaking down of food by a chemical processBreaking down of food by a chemical process

SalivaSaliva Stomach acidStomach acid

Traveling in the Digestive Traveling in the Digestive SystemSystem MouthMouth

Mechanical and Chemical digestionMechanical and Chemical digestion Teeth, Tongue, Salivary glands Teeth, Tongue, Salivary glands

EsophagusEsophagus Mechanical Digestion (Peristalsis)Mechanical Digestion (Peristalsis)

StomachStomach Mechanical and Chemical digestionMechanical and Chemical digestion Muscles in stomach mix and mashMuscles in stomach mix and mash Strong Stomach acids break down foodStrong Stomach acids break down food

Small IntestineSmall Intestine Chemical digestionChemical digestion Most of nutrients are absorbed in small intestineMost of nutrients are absorbed in small intestine

Villi absorb nutrientsVilli absorb nutrients

Large IntestineLarge Intestine Water and small amounts of nutrients are absorbedWater and small amounts of nutrients are absorbed Solid waste material stored until eliminated through rectumSolid waste material stored until eliminated through rectum

Other Organs involved in Other Organs involved in DigestionDigestion

Salivary GlandsSalivary Glands Produce saliva to begin chemical digestionProduce saliva to begin chemical digestion

LiverLiver Filters bloodFilters blood Stores unneeded nutrients for later useStores unneeded nutrients for later use Produces bile to break down fatsProduces bile to break down fats

Breaks down medicinesBreaks down medicines GallbladderGallbladder

Stores bileStores bile

PancreasPancreas Produces chemicals that reduce acid in small intestineProduces chemicals that reduce acid in small intestine Produces digestive chemicals that prepare nutrients to be absorbed.Produces digestive chemicals that prepare nutrients to be absorbed.