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Advanced Biology II
Digestive System Practice Sheet
Fill-in-the-Blank
(1) is a large concept that encompasses processes by which food is ingested, digested,
absorbed, and later converted into the body’s basic nutrients, which include (2), (3) (also known
as fats), proteins, and nucleic acids. The simplest way to think about the digestive system is
that it is a long tube – we call this tube the digestive (4). There are also (5) organs that secrete
enzymes and other substances that help food get digested in the tube.
The human digestive system is a tube between 21 and 30 feet long, with two openings –
the (6) and the (7). The (6) contains the salivary glands, which begin the digestion process. In
the mouth, saliva contains an enzyme, (8), that breaks down starch. This is the first example of
the process of (9), which continues in the stomach and small intestine. The process of (10)
begins in the mouth as well, as you begin chewing. Food moves from the (6) to the pharynx,
which pulls it into the (11) – the muscular tube that propels food to the stomach. In the
stomach, the enzyme (12) begins digesting proteins, while (13) acid helps activate it and also
kills some bacteria.
From the stomach, food moves into the (14), which digests food with enzymes from the
liver, gallbladder, and (15). This process of these accessory organs releasing these enzymes is
called (16), another important part of the overall digestion process. (17), also occurring in the
small intestine, is another important part of digestion. This absorption is helped because of the
many finger-like projections, called (18), that increase the surface area of the small intestine.
Any leftover water and minerals are absorbed by the (19). By removing the water, the (19)
helps concentrate undigested matter so elimination can occur. Eating plenty of (20), which is
difficult to digest and provides bulk in the intestine, helps keep the elimination process regular.
Diagrams Labeling
Digestive System – Basic
Use the following terms: Mouth, Stomach, Gallbladder, Large Intestine, Pharynx, Salivary
Gland, Liver, Small Intestine, Esophagus, Rectum, Pancreas
21.
25.
29.
22.
26.
30.
23.
27.
31.
24.
28.
Digestive System – Advanced
Use the terms provided on the diagram.
32.(1)
37.(6)
42. (11)
33.(2)
38.(7)
43.(12)
34.(3)
39.(8)
44.(13)
35.(4)
40.(9)
45. (14)
36. (5)
41.(10)
46. (15)
Mouth and Intestine
Use the following terms: Tongue, Epiglottis, Esophagus, Mouth, Teeth, Pharynx, Gallblader,
Bile duct, Duodenum(2 times), Pancreas(2 times), Pancreatic duct
47.(1)
52.(6)
57.(11)
48.(2)
53.(7)
58.(12)
49.(3)
54.(8)
59.(13)
50.(4)
55.(9)
51.(5)
56.(10)
Tory Torso
57.(71)
58.(72)
59.(51)
60.(65)
61.(66/74)
62.(75)
63.(76)
64.(67)
SmartBoard
Do the Digestive Organs Ordering activity. Write the organs in order below:
65.(1)
69.(5)
73.(9)
66.(2)
70.(6)
67.(3)
71.(7)
68.(4)
72.(8)
74.(10)
Play the Digestive System Terms Matching game. Record the terms you click on, and
paraphrase the information that goes in the matching box.
75.
79.
76.
80.
77.
81.
78.
82.
Matching
Match the organ to the digestive system with its correct function.
83.Mechanically breaks down food, mixes it with saliva.
84.Secretes fluids that moisten food and digest carbohydrates.
85.Stores, mixes, and dissolves food. Kills bacteria and starts protein digestion with acids.
86.Digests and absorbs the majority of all nutrients.
87.Produces bile, which helps buffer acids in the stomach and start breaking down fats.
88.Stores bile and releases it in a controlled way.
89.Absorbs water and minerals, stores and concentrates undigested matter.
90.Secretes a large number of enzymes that digest many different food nutrients.
91.Controls the elimination of solid wastes in the body by storing and then expelling them.
A.
B.
C.
D.
E.
Stomach
Liver
Mouth
Salivary glands
Rectum
F.
G.
H.
I.
Small intestine
Large intestine
Pancreas
Gallbladder
Match the enzyme to the nutrient it breaks down. Answers may be used more than once.
92.Salivary amylase
93.Bile
94.Sucrase
95.Peptidase
96.Pancreatic amylase
97.Lactase
A. Carbohydrates
B. Proteins
C. Lipids (fats)