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The Digestive System

The Human Body- Unit 7

QuestionAnswer
What is the Digestive System? -a collection of organs that work together to break down food so that it can be used by the body
What are the 2 types of digestion? -mechanical digestion -chemical digestion
Describe mechanical digestion. -the breaking, crushing, or mashing of food (mouth, esophagus, stomach)
Describe chemical digestion. -large molecules are broken down into nutrients using enzymes and other chemicals (mouth, stomach, small intestine)
What is the digestive tract? -the path that food takes throughout the body
What is the path of the digestive tract? -mouth, throat, esophagus, stomach, small intestine, large intestine, rectum, anus
Explain each part of the digestive tract. The Mouth -uses teeth to mechanically digest food; uses saliva (with enzymes) to chemically digest food
Explain each part of the digestive tract. The Throat -the tube that leads to the esophagus
Explain each part of the digestive tract. The Esophagus -squeezes food (peristalsis) into the stomach (mechanical digestion)
Explain each part of the digestive tract. The Stomach -continues mechanical digestion -enzymes and acids help chemically digest food -the acid environment helps kill bacteria -food is reduced to chyme.
Explain each part of the digestive tract. The Small Intestine -takes in chyme and continues chemical digestion; villi increases the surface area of the small intestine to allow for more nutrient absorption
Explain each part of the digestive tract. The Large Intestine -removes water from undigested food and it compacts
Explain each part of the digestive tract. The Rectum -it holds undigested food
Explain each part of the digestive tract. The Anus -undigested waste is eliminated
What do secondary organs do for digestion? -food does NOT pass through these organs, but they aid in digestion
Name the secondary organs. -pancreas, liver, gall bladder
What is the function of the pancreas? -it secretes more enzymes into the small intestine and absorbs nutrients -it creates bicarbonate which helps neutralize acid
What is the function of the liver? -it makes bile, which breaks down fat -it stores nutrients -it breaks down toxic substances in the blood -it makes cholesterol for the cell membranes
What is the function of the gall bladder? -it temporarily stores bile and secretes it into the small intestine
Name some problems with the digestive system. -heartburn, constipation, diarrhea, colon cancer, gastric ulcer
What is heartburn? -a backflow of chyme into the esophagus causes a burning pain in the chest
What is constipation? -not enough fiber, water, or exercise can lead to very dry waste
What is diarrhea? -problems in the absorption of water; can lead to dehydration
What is colon cancer? -cancer in a long portion of the large intestine
What is a gastric ulcer? -an open sore in the stomach lining; can be caused by bacteria
Created by: carlsond