Prepared by Patty Bostwick-Taylor,
Florence-Darlington Technical College
CHAPTER
1
The Human Body:
An Orientation
© 2012 Pearson Education, Inc.
The Human Body—An Orientation
Anatomy
• Study of the structure and shape of the body and its parts
Physiology
• Study of how the body and its parts work or function © 2012 Pearson Education, Inc.
Anatomy—Levels of Study
• Gross anatomy
• Large structures
• Easily observable
© 2012 Pearson Education, Inc.
Mouth (oral cavity)
Tongue
Parotid gland
Sublingual gland
Submandibular
gland
Salivary glands
Pharynx
Esophagus
Stomach
Pancreas
(Spleen)
Liver
Gallbladder
Small intestine
Anus
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Duodenum
Jejunum
lleum
Transverse colon Descending colon Ascending colon Cecum
Sigmoid colon
Rectum
Appendix
Anal canal
Large intestine
Figure 14.1
Anatomy—Levels of Study
• Microscopic anatomy
• Structures cannot be seen with the naked eye
• Structures can only be viewed with a microscope © 2012 Pearson Education, Inc.
Gastric pits
Gastric pit
Pyloric sphincter Surface epithelium Mucous neck cells
Gastric gland
Parietal cells
Gastric glands Chief cells
(c)
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Figure 14.4c
Pepsinogen
HCl
Pepsin
Parietal cells
Chief cells
Enteroendocrine
cell
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(d)
Figure 14.4d
Molecules
Smooth muscle cell
2 Cellular level
Cells are made up of molecules.
Atoms
1 Chemical level
Atoms combine to form molecules.
3 Tissue level
Tissues consist of similar types of cells.
Smooth muscle tissue
Blood vessels Heart
Epithelial tissue Smooth muscle tissue
Connective
tissue
4 Organ level
Organs are made up of different types of tissues.
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Blood vessel (organ)
Cardio– vascular system
5 Organ system level
Organ systems consist of different organs that work together closely.
6 Organismal level
Human organisms are made up of many organ systems. Figure 1.1
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