Survey
* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project
Download Large intestine
Document related concepts
no text concepts found
Transcript
Absorption Intestine Surface Area Absorption of nutrients has to occur across surface area. Intestine is LONG – Small intestine = 6 meters or 20 feet – Large intestine = 1.5 meters or 5 feet Circular folds (plicae) increase surface area Surface Area Surface Area Villi - Small fingerlike projections from surface of circular folds or intestine wall. Increase surface area. Small intestine Villi Surface Area Microvilli - Tiny projections from villi. Increase Surface Area Surface Area 25 feet long and 1.5 inches in diameter what is the surface area without circular folds, villi and microvilli? Surface Area With circular folds, villi and microvilli the surface area is 3230 square feet. Tennis court = 2800 square feet. Lung Skin Intestine Diffusion Food molecules diffuse from intestine across single cells of microvilli and into blood and lymph Columnar Lymph epithelium vessel Fatty acids Amino acids Monosaccharides Blood vessel network Appendix Blind ended tube at junction between small and large intestine. Seems to serve no purpose at all in humans. Appendix Large Intestine Also called colon Removes water, salts and a couple of vitamins from remainder of chyme Large intestine Feces Remaining food waste is called feces. Eliminated through rectum and anus. Rectum Anus
Related documents