Cells and Tissues
Cells Have Distinct Parts
50
The Plasma Membrane Is the Cell's Gatekeeper
52
The Cytoplasm Contains Many Organelles
53
The Nucleus Controls the Cell's Activities
56
Cells Carry Out Many Processes
57
Membranes Transport Substances
57
Proteins Are Made in a Complex Process
64
Cells Divide by Mitosis or by Meiosis
67
Cells Specialize into Various Tissues
71
Epithelial Tissue Covers Body Surfaces
72
Connective Tissue Protects and Supports the
Body and Its Organs
76
Muscle Tissue Generates Force for Movement
81
Nervous Tissue Transmits Impulses to
Coordinate Activities
81
Membranes Cover or Line Parts of the Body
82
Aging Affects Cells and Tissues
84
The Integumentary System
The Integumentary System Is Composed
of Skin, Glands, Hair, Nails, and Nerve Endings
92
There Are Many Components of the
Integumentary System
92
Skin Is a Multilayered Organ
93
Skin Color Is Caused by Pigments
95
Accessory Structures Provide Protection
and Help Regulate Body Temperature
96
Hair Protects the Skin and Other Structures of
the Body
96
Glands Produce Secretions That Perform a
Variety of Functions
98
Nails Are Composed of Keratinized Dead Cells
99
The Skin Plays a Number of Roles in the Body
100
■ WHAT A HEALTH PROVIDER SEES: Skin Grafts
and Artificial Skin
104
Skin Cancer and Aging
105
Aging Changes the Appearance and Quality
of Skin and Its Associated Structures
105
Skin Cancers Can Develop from Repeated
Exposure to UV Radiation
105
Contents xxiii
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