Download A ECL 365 Worksheet 2.4

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?
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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.