Digestion Clip by Brainpop

Nutrients…

• Are substances in food that provide energy and materials for cell development, growth, and repair.

Classes of Nutrients

Carbohydrates: main source of energy

Proteins: used for growth. Made of amino acids.

 Fats: provide energy (stored) and help body absorb vitamins

Vitamins: organic nutrients that help your body to use other nutrients.

Classes of Nutrients

CarbohydratesProteins  FatsVitamins.

ORGANIC

(Contain carbon)

Classes of Nutrients

Minerals: Inorganic nutrients that regulate many chemical reactions in your body.

Water: Most vital factor for survival, other than oxygen. Water enables chemical reactions to take place in your cells.

Classes of Nutrients

MineralsWater

Digestion and Nutrients

Inorganic

(no carbon)

Enzymes

Enzymes are molecules that speed up the rate of chemical reactions

They do this without being changed or used up.

Enzymes also speed up reactions by reducing amount of energy necessary for a chemical change to begin.

Digestive Enzymes are:

AMYLASE is a starch-degrading enzyme secreted in the mouth. This enzyme breaks down carbohydrates.

PEPSIN, found in the stomach, causes complex proteins to break down into less complex proteins.

Enzymes are also responsible for MANY chemical reactions in your body---not just the ones involved in digestion!

Your Digestive System

Mouth: Begins chemical & mechanical digestion, glands in mouth produce saliva, which contains amylase, which breaks down starch

MOUTH

Your Digestive System

Esophagus: muscular tube that connects throat to stomach. Moves food down by squeezing (peristalsis)

ESOPHAGUS

Your Digestive System

Stomach: muscular bag where chemical and mechanical digestion continue; food stays here ~4 hours, changes to chyme

STOMACH

Your Digestive System

Small Intestine: tube nearly 7 meters long where digestive juices from liver and pancreas are added; villi absorb molecules from chyme

Small Intestine

Your Digestive System

Pancreas: a small organ that produces substances that stop the action of stomach acid, makes enzymes that break down carbohydrates

PANCREAS

Your Digestive System

Large Intestine: absorbs water from undigested food, where unabsorbed materials become more solid

LARGE INTESTINE

Your Digestive System

Liver: produces bile, which is stored in gall bladder. Bile breaks up large particles of fats into smaller particles.

LIVER

Your Digestive System

Gall Bladder: small sac that stores bile produced by liver

GALL BLADDER

Your Digestive System

Rectum: where muscles control the release of wastes from the body

RECTUM

Digestive System Clip by Brainpop

The Process of Digestion Clip

(13 minutes)