1
2
CHEMICAL LEVEL
CELLULAR LEVEL
3 TISSUE LEVEL
Smooth muscle cell
Atoms (C, H, O, N, P)
Molecule (DNA)
Smooth muscle tissue
5 SYSTEM LEVEL
Epithelial and
connective tissues
4 ORGAN LEVEL
Salivary glands
Pharynx
Mouth
Smooth muscle
tissue layers
Esophagus
Epithelial tissue
Stomach
Liver
Stomach
Gallbladder
Pancreas
(behind stomach)
Large
intestine
6 ORGANISMAL LEVEL
Small intestine
Digestive system
Copyright © 2014 John Wiley & Sons, Inc. All rights reserved.
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