1' Label the following structures of the digestive system'

1
1. Label the following structures of the
digestive system.
A.

• (state the
• name of the
• sphincter)

C.
2
K.
D. (name the sphincter here)
E.
G.
H.
F. (name the sphincter here)
I.
J.
L.
3

• Fill in the blanks.
• Insulin is a _____a)___ produced in the
  ___b)______. Its job is
• to lower ______c)______.
• During swallowing, the __d)______ blocks the
  nasal opening, and the ______e)____ blocks the
  trachea.
• _____f)____ prevents the bolus from moving
  backward through the digestive tract.
• The livers stores glucose in the form of
  ___g)_______. The liver
• also produces ____h)_______, whose job is to
  emulsify ____i)______.
• Most digestion and absorption occurs in the
  ___j)______.
• ____k)_______ are finger-like projections into
  the lumen of the
• ______l)_________.
• The epithelial cells of the villi contain
  ______m)_____, which
• further increase the surface area of the small
  intestine wall.
• Glucose and amino acids are absorbed into the
  __n)_____, while
• glycerol and fatty acids are absorbed into the
  ___o)___.
• The ___p)______ contains ____q)___ bacteria,
  whose job it is to
• break down material that is otherwise ____r)____
  by the body.

4

• Name the enzyme that best matches the
  description.
• Breaks down maltose
• Produced by the salivary glands
• Converted to pepsin in the presence of HCl
• Digests proteins in the stomach
• Digests proteins in the small intestine
• Breaks down nucleic acids
• A collective term for pepsinogen, pepsin, and
  trypsin
• Breaks lipids into glycerol and fatty acids
• Breaks up starch into maltose

5
4. True or False?

• HCl is a component of gastric juice.
• Sodium bicarbonate is a component of intestinal
  juice.
• Mucus aids in chemical digestion.
• Trypsin prefers a higher pH to pepsin.

6
Answer Key

• A. salivary glands J. appendix
• Upper esophageal sphincter K. liver
• esophagus L. rectum
• cardiac sphincter
• Stomach
• Pyloric sphincter
• Pancreas
• Small intestine
• Large intestine

7

• a) hormone o) lacteals
• Pancreas p) colon or large intestine
• Blood glucose q) anaerobic
• Soft palate r) indigestible
• Epiglottis
• Peristalsis
• Glycogen
• Bile
• Fat
• Small intestine or duodenum
• Villi
• Small intestine
• microvilli
• Capillaries

8

• a) maltase 4. a) true
• Salivary amylase b) false
• Pepsinogen c) false
• Pepsin d) true
• Trypsin
• Nuclease
• Protease
• Lipase
• amylase