The

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The Digestive System
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Nutrients

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

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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.

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Classes of Nutrients

• Carbohydrates
• Proteins
•  Fats
• Vitamins.

ORGANIC (Contain carbon)
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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.

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Classes of Nutrients

• Minerals
• Water

Inorganic (no carbon)
Digestion and Nutrients
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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.

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Digestive Enzymes

• AMYLASE is a starch-degrading enzyme secreted in
  the mouth. This enzyme breaks down carbohydrates
  (starches).
• 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!

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Your Digestive System

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

MOUTH
Mouth
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Digestive System

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

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Your Digestive System

• Stomach muscular bag where chemical and
  mechanical digestion continue food stays here 4
  hours, changes to chyme(watery liquid made of
  partially digested food)

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Digestive System

• Small Intestine tube nearly 7 meters long where
  digestive juices from liver and pancreas are
  added villi absorb molecules from chyme (which
  increase surface area for absorption)

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Your Digestive System

• Pancreas a small organ that produces substances
  that stop the action of stomach acid, makes
  enzymes that break down carbohydrates (secretes
  digestive juices into the small intestine)

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Digestive System

• Large Intestine absorbs (removes) water from
  undigested food where unabsorbed materials become
  more solid (waste).

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Digestive System

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

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Your Digestive System

• Gall Bladder small sac that stores bile produced
  by liver

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Your Digestive System

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

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Digestive System Clip by Brainpop