Digestive System Tavelogue
- digestion begins and food is moistened
- teeth break down food so chemical digestion can occur faster
moves food - pushes food to
back where food is swallowed
- proteins and fats are mechanically digested in mouth
- carbohydratres are chemically digested in the mouth by saliva
- tear, scrape and chew food
divided into 2 parts
walls of muscle
- Respiratory and Digestive system meets here
- Swallowing is accomplished by reflexes that close the opening of the trachea
Propulsion consists of alternating contraction and relaxation of smooth muscle in the walls of the GI tract to squeeze food downwards.
- glands in the walls of the esophagus produces mucus, which keeps the passageway moist and helps food passing through
- perstalsis begins here to move materials through GI tract
C-shaped about 10 in long
- holds up to 1 gallon of food
- Pepsinogen - breaks down proteins
- the muscular walls of the stomach contract rapidly to break down and mix gastric juices and food together
- food mixes with enzyms and HCL and broken down ino smaller pieces - called "chyme"
- stomach acid also kills bacteria to protect the body
- minimal absorption occurs
forceful expulsion of the contents of one's stomach through the mouth and sometimes the nose.
- first part of the small intestine
- "Chyme" enters through a sphincter.
proteins and carbohydrates are only partially digested and lipid digestion has not begun
- pancreas acts as enxocrine gland
- produces bile which is stored in the gallbladder
- average is 6 - 13 feet long and divided into three parts
- bile breaks down fats and insulin breaks down carbohydrates
- Chemicals neutralize stomach acids
- some absorption of vitamins and minerals takes place
- about 5 feet long and divided into 3 portions
the last 20cm of the larget intestine is the rectum
- absorption of water and some other nutrients
- eliminating solid, semisolid or liquid waste material from the digestive tract - through the anus
breaks starch into maltose
The epiglottis closes the trachea
- food passes from the pharynx to the stomach through this
- soft, triangular gland extends between spleen and duodenum
- Pancreatic amylase
- Trypsin
- Lipase