Digestive System What is digestion and where does it start?

The Digestive System _____________________________________ & _____________________________________

Digestion _________________________ break down of foods – Teeth-break down food into small pieces __________________________—process of chewing ___________________ break down of foods – Saliva- _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________. – Both for use by the cells of the body

Digestion Chemical break down of foods – _______________-produced by the salivary glands; the first juices used in the process; break down starches and sugars in foods; lubricates food making it easier to swallow. – _______________

Digestion Tongue – _______________________________________________ _______________________________________________ ___________________________ ____________________ – 10” muscular tube that connects the pharynx with the stomach

Digestion Peristalsis – _________________________________________ _________________________________________ _________________________________________ Esophagus Stomach intestines

Digestion _____________________________ – Hollow, sac-like organ surrounded by muscles which allow for expansion during ingestion. – 3 Jobs ___________________________________

stomach Mix food with juices: – Secretions from the stomach lining that contain _________________________________,& _________________________________, an enzyme that breaks down proteins _________________—kills bacteria in food and creates an acidic environment for the pepsin to do its job – _______________________ in the lining of the stomach protects the stomach from being digested in its own juices

stomach Chyme _____________________________________________ _____________________________________________ _____________________________________________ » YUCK!!! But it is what it is!!! :~)

Indirect Digestive Organs _____________________________________ & _____________________________________

pancreas Organ that produces enzymes that break down the ____________________, ____________________, and ____________________we consume. Organ that is essential in insulin (______________ ______________) control.—Diabetes I and II.

liver Organ that produces ___________________ – Yellow-green fluid that helps break down and absorb _______________ – ________________________—when the liver is not functioning properly the skin and eyes can become yellow from an excess of ____________ in the system.

gall bladder ___________________________________________ ___________________________________________ ___________________________________________ You can live without, but fatty foods will affect the body more than a body with a gall bladder. Can become filled with painful gall stones

Absorption _____________________________________ _____________________________________ _____________________________________ _____________________________________

absorption ______________________ – 20-23’ long – 1” diameter – Finishes digestion and begins absorption in the ______________—finger-like projections in intestines ______________________ – 5-6’ long – 2.5” diameter – Finishes absorption and begins ______________________

Elimination Expulsion of undigested food or body wastes Begins with large intestine—eliminate ______________ Skin excretes some wastes through the pores—__________________ Lungs expel _________ and other gas wastes Liquids are filtered to the ___________________________ for expulsion