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The Intestines The Intestines • We need to get perspective on the length of the digestive tract • In order for that to happen we need to figure out the length of the human digestive tract • For a normal human, the digestive tract can be 27 – 33 feet long • Lets measure it out! The Intestines • The intestines take up the bulk majority of that length • This is because the two intestines are designed to absorb materials that exit the stomach • The longer that each intestinal segment is, the better chance it has of absorbing nutrients The Intestines • The small intestine is a 18-20ft tube that is involved in absorbing food that has passed through the stomach • Around 90% of the nutrients that are absorbed by the body are absorbed through the small intestine • The large intestine is a 5ft horseshoe shaped organ that absorbs water and pushes the remainder of the unabsorbed food out of the body The Intestines • http://www.webmd.com/diet/o besity/video/bariatric-surgery The Small Intestine • The small intestine has the job of absorbing food for the body • However, more surface area contact between food and intestine means that there will be more absorb ion • We have previously talked about the ways to increase food surface area, now it is time to think about the small intestine The Small Intestine • The small intestine is roughly 20 feet long and 1 inch wide • With a partner, come up with an estimation for the total surface area of the small intestine • That would mean… • How many square feet would the small intestine be if we laid it out flat like a rug • This measurement should be in (ft2) • Go ahead and give it a try! • The answer? • Roughly 2,700ft2 • Roughly the size of a tennis court Or In A Slightly More Depressing Fact • Look up your house on Zillow.com (a real estate website) • See if the surface area of your intestine is bigger or smaller than the floor space of your home… The Small Intestine • So how is such a large surface area possible? • Each part of the intestine is packed with little finger-like projections called villi • These villi are covered in even smaller microvilli that help absorb and increase surface area even more • The combination of these two create that large surface area The Small Intestine • The small intestine has three main sections that all perform different functions • These sections are all based off how far away from the stomach the section of intestine happens to be • The duodenum is the first part of the intestine and is a mixing bowl for many different chemicals • The duodenum is normally only 10 inches long The Small Intestine • The jejunum is the middle section to the intestine that is heavly involved in nutrient absorption • It is normally around 8 feet long • The ileum is the final and longest (11ft) segment of the small intestine • It is involved in nutrient absorption and the flow of material into the large intestine The Small Intestine • Stupid way to remember the sections of the intestine… • Duodenum • Jejunum • Ileum • Who is playing at the hottest clubs? • DJ Ileum