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Digestion II: Worksheet 2.4 Supplemental Instruction Iowa State University Leader: Course: Instructor: Date: Travis A ECL/BIOL 365 Dr. Adams 10/4/16 1.) The ___________________ is where most chemical digestion occurs. This is also the major site of absorption of food material (nutrients), which takes a long time. 2.) The internal surface area of the small intestine is increased by _______. 3.) The large intestine is the major site of ________ re-absorption and also compacts _______. Why is the large intestine the most developed in terrestrial vertebrates? 4.) In mammals and many fish, the large intestine terminates in a ________ & ______. However, in sharks, amphibians, reptiles, & birds, it ends in a _________. 5.) The _______________ usually contains bacteria that help digestion. This is a pouch in the wall of the ____________. a. Teleost fish have several of these called ____________________ and few reptiles have this organ. b. In birds and mammals it’s located between the ______ and _______ intestine. It is most developed in ______________. c. In humans, this is known as the vestigial cecum or __________ and is very reduced. The function is still debated. 6.) Name the 3 accessory organs connected to the digestive tract. Each of these connects near the start of the ______________________. 7.) The largest gland in the body is the _______, which lies over the stomach. Name a few of the important functions of the liver. 8.) The _______________ is a blind sac that stores _______. (covered by the liver). Bile is needed for the breakdown of ______. Without it, fats would pass through the digestive track ______________. What else does bile do? And what other organ does this same function? 1060 Hixson-Lied Student Success Center 515-294-6624 [email protected] http://www.si.iastate.edu 9.) The ____________ produces enzymes to break down food molecules. It breaks down fats to ________________and carbohydrates to _____________. 10.) Name a few factors that influence the size of the digestive tract. 11.) What conclusion can be drawn from the study on fish in a Panamanian stream, where they compared body size to gut size? 12.) Lampreys do not have a ___________ to aid in digestion. 13.) Match the digestive system with the correct lineage: fish, amphibian, reptiles, birds, or mammals.