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The Digestive System
Transcript of The Digestive System
Digestion starts before even the first bite.
When you smell the food, your saliva glands start working.
When you begin chewing, the food is broken down into pieces that are smaller and more easily digested.
Along with saliva, "juices" are produced that will help to further break down food. The Esophagus The Stomach The Small Intestine The Large Intestine The Colon The Rectum The Anus After the mouth comes the esophagus.
This leads to the stomach.
The job of the esophagus is to push food down to the stomach! A sac-like organ with strong muscular walls.
Mixes and grinds the food with digestive juices.
Secretes acid and power enzymes that continue breaking down food, making it into a liquid/paste.
Between meals, the parts that could not be liquified are released from the stomach to the small intestine. The small intestine continues to breakdown food.
The Small intestine is known of the 'work horse' of the digestive system because it absorbs most of the nutrients.
What's leftover (the waste) moves into the large intestine (large bowel or colon). The colon is a five- to seven -foot -long muscular tube that connects the small intestine to the rectum (It's long, but the small intestine is longer!)
Specializes in the processing and removal of solid wastes.
As stool passes through the colon, any remaining water is absorbed.
Stool is stored in the sigmoid colon until a "mass movement" empties it into the rectum, usually once or twice a day.
It normally takes about 36 hours for stool to get through the colon, mostly debris and bacteria. Eight-inch chamber that connects the colon to the anus.
Receives stool from the colon
Lets the person know there is stool to be evacuated
Holds the stool until evacuation happens
Sensors send signals to the brain to decide if the contents can be released.
If it can, the sphincters relax and the rectum contracts, expelling its contents.
If the contents cannot be released, the sphincters contract and the rectum makes sure the sensation temporarily goes away The last stop of the digestive tract, consisting of muscles that line the pelvis and two anal sphincters (internal and external).
Anal sphincters provide control of stool.
Internal sphincter is always tight, except when stool enters the rectum.
It keeps us from releasing stool when we're sleeping or unaware of it.
We rely on the external sphincter to keep it in until we make it to the restroom. The Liver Makes and secretes bile.
Processes the blood coming from the small intestine containing the nutrients just absorbed.
Purifies this blood of many impurities before traveling to the rest of the body. The Gallbladder Storage sac for excess bile.
Bile made in the liver travels to the small intestine, if it's not needed, the bile travels into the gallbladder.
It waits here until the signal that food is present.
Bile serves helps absorb fats in the diet, and carries waste from the liver that cannot go through the kidneys. The Pancreas Pancreas makes digestive enzymes that are secreted into the duodenum.
Those enzymes break down protein, fats, and carbohydrates. Diseases of the Digestive System Acid Reflux- When stomach contents leak backwards into the esophagus because the lower esophageal sphincter fails to close. It can cause heartburn and even damage the esophagus.
Diveritcular Disease- When pockets develop in the colon wall and become inflamed. In some cases, fissures can develop and surgery is necessary.
Diarrhea- Having three or more loose bowel movements a day. Possible causes are infections, allergies to foods, alcohol abuse, and medicatons.Can lead to severe dehydration and even hospitalization. The End If you spread out the small intestine flat, how big would it be?
A) The size of a Cobra snake?
B) The size of a garden hose?
C) The size of PAS
D) The size of a baseball diamond? What's the correct order of the digestive tract?
A) 1) Mouth, 2) Small Intestine, 3) Large Intestine,
4) Esophagus, 5) Stomach, 6) Rectum
B) 1) Mouth 2) Esophagus, 3) Stomach,
4) Small Intestine, 5) Large Intestine, 6) Rectum
C) 1) Mouth 2) Esophagus, 3) Stomach,
4) Large Intestine 5) Small Intestine 6) Rectum
Which member of the digestive tract absorbs the most nutrients?
B) Small Intestine
C) Large Intestine
Quiz Time What does the brain need to function? How does food turn into energy? It's digested! Welcome back!
Let's Review the brain!
Does anyone remember the 3 parts of the brain?
Do you remember what each part does?
Brain Stem?? Now let's learn more about food! Go eat! You must be starving!