Multiple Choice
Figure 22- 1 The Wall of the Small Intestine
Use Figure 22- 1 to answer the following questions:
-Contraction of the muscle layer labeled "9" causes the digestive tract to
A) dilate.
B) fold for increased surface area.
C) shorten.
D) secrete enzymes.
E) constrict.
Correct Answer:

Verified
Correct Answer:
Verified
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