Welcome – today we begin Our next interesting unit … The human digestive system Please dig out your note stuff.

Welcome – please dig out Your notes for a little review A great film and Then our digestive system Castle lng quiz.

Welcome – please dig out Your notes today we finish Them up and do a castle Learning quiz.

The Digestive system – goal Is to get nutrients(Good stuff From food) into a liquid form (Soluable) so it can be Transported by blood to cells

Ingestion – taking in food.

Digestion begins in the mouth With the teeth grinding, Cutting, tearing food = Mechanical or Physical digestion.

Chemical digestion also Begins in the mouth with The salivary glands releasing Saliva which breaks down Starch using the enzyme Amalyase.

Esophagus – tube that connect The mouth and stomach. Peristalsis – muscular wave Like contractions that move Food, occurs in the esophagus Stomach and both intestines.

                   

Stomach – muscular sac, both Chemical and mechanical Digestion occurs here. Chemical – gastric glands of Stomach secrete HCL and Gastric protease – enzyme, Breaks down proteins

                   

         

Small intestine – most Chemical digestion occurs Here.

Villi – finger like projections of The small intestine, this is Where absorbtion of nutrients Into blood Occurs.

https://www. youtube. com/watch https://www.youtube.com/watch?v=jTz2KpP1lVs&list=FLv86ZP7JCXSSP3opJWTuxwg&index=57

https://www. youtube. com/watch https://www.youtube.com/watch?v=w-VPulmxI9A&list=FLv86ZP7JCXSSP3opJWTuxwg&index=58

The passage of end products Of digestion into cells is ABSORBTION

Liver – secretes bile which is Stored in the gall bladder and Released into small intestine To break down fats = Emulsification. .

                                               

Large Intestine –Major function Is to reabsorb water.

Undigested materials are then Excreted = egestion

GI tract = gastrointestional Tract, one way digestive tube. Hydrolysis – large food particles Are broken down using water. Pancreas – secretes digestive Enzymes into small intestine

Nat Geo – digestion 5 min. https://www.youtube.com/watch?v=_QYwscALNng

Nutritional digestive info. Carbohydrates – major energy Source.(made of simple sugar = glucose) Cellulose = roughage, Fiber, helps Move food through GI tract, Ex. = lettuce, grains, fruits

Carbohydrates and proteins Are to big to pass through The cell membrane. They Must be broken down into – Simple sugars = carbohydrates Amino acids = proteins

Starches are also to large And must be broken down – Digested into simple sugars.

Proteins – growth and repair, Broken down into amino acids Which are used to make human Proteins. Fats – energy & need to form All your cell membranes Saturated fats – bad for Cardiovascular system. Found In animal fat =cholesterol

. Disorders Ulcer – sore in stomach lining

Constipation – too much water Is removed from large Intestine.          

Diarrhea – not enough water Is removed by Lg. Intestine Appendicitis – inflamation of Small pouch at beginning of Large intestine.

Gallstones – hardened Cholesterol deposits, may Block the flow of Bile_ .