Sun  Supper  Sweat Convey in 20 words or less, how solar energy transfers to food energy and then to cellular energy (ATP) which is used to do the work of the body.

Photosynthetic magic transfer solar to food energy Tasty meal Cell respiration transfers food energy to cell fuel. Voila, push ups

How Food Becomes You Consumption Digestion Absorption Transport Metabolism

THE FUN PART FOOD CONSUMPTION

What factors influence your food choices?

Digestion

What do you think? T/F There is acid in the stomach that could burn your skin. Swallowed gum stays in the stomach about a week. Food really can go down the wrong ‘tube’. A healthy GI tract is clean (sterile). Food is made into ATP in the GI tract.

Gastrointestinal Tract The Food Tube  Runs through the body  Gatekeeper to the body  Whole foods  component parts to be absorbed into bloodstream Proteins  ? Carbs  ? Fats/Oils  ? Vitamins, minerals, water absorbed ~as is

Digestive Processes Digestive Processes of GI Tract ChemicalMechanical Chewing Peristalsis Acids Bases Water Enzymes Relevant terms  Reverse peristalsis  Emulsification  Denaturation  Hydrolysis A delish practical application of a few of these termspractical application

In ‘N Out ~ 30’ of muscular tube, nerves, secretory organs Mouth Esophagus Stomach Small Intestine (SI) Large Intestine (LI) Rectum/Anus How long is this ‘trip’?

In ‘N Out ~ 30‘of muscular tube, nerves, secretory organs Mouth Esophagus Stomach Small Intestine (helpers) Large Intestine (LI) Rectum/Anus How long does this take?

Digestive Brew Dumps into SI  Liver  makes bile to emulsify fat  Gall Bladder  concentrates/stores/secretes bile  Pancreas  makes/secretes digestive nz  SI  makes digestive nz for digestion

Large Intestine (LI) Water re-absorption Good bacteria make ~Vitamin K  aka ‘probiotics’ Bad bacteria cause sickness What NOT absorbed… is waste excreted Bacteria and Fiber (↑ fiber ↓ transit time) What are prebiotics?

Absorption Digested nutrients move thru wall of SI into bloodstream  Carbs as glucose  Protein as amino acids  Fats/oils as chylomicrons ( type of lipoprotein) Heart pumps blood to ‘feed’ all cells

Fig. 3-10, p. 81

Nutrient Roadmap Consume food Digest Absorb Transport What’s next?

Nutrient Roadmap Consume food Digest food Absorb nutrients Transport to cell Cells metabolize nutrients… make energy (ATP) build ‘stuff’ store extra calories as fat!!

What do you think now? T/F There is acid in the stomach that could burn your skin. Swallowed gum stays in the stomach about a week. Food really can go down the wrong ‘tube’. A healthy GI tract is clean (sterile). Food is made into ATP in the GI tract.

Summary…how food becomes you! Digest…..breakdown whole food Absorb….transfer nutrients into blood Transport…. move nutrients to cells Metabolize….cell use or store nutrients Think before you eat…!

Optional slides

Fig. 3-11, p. 82

Fig. 3-13, p. 89 Misdirected Morsels

p. 85 Rate of Digestion

p. 85 Rate of Digestion

Major Organ Roles in Digestion Mouthmechanical is primary carb digestion begins Stomachchemical is primary protein digestion begins SI#1 site of chem digest most nutrients absorbed here LIwater reabsorbed into blood

Metabolism-what happens in cells  NRG nutrients  cell fuel (ATP)  Nutrients perform specific jobs  Excess energy nutrients convert to fat and are stored ….!