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I. Types of muscle
II. Main functions for homeostasis
     A. Movement
     B. Support
     C. Heat production
III. Age changes versus other changes
IV. Muscle cells
     A. Structure and functioning
          1. Cell membrane
          2. Myoglobin, oxygen, and energy
               a. Contraction
               b.Types of muscle cells
          3. Age changes in muscle cells
               a. Internal components
               b. Cell thickness
               c. Cell number
               d. Cell repair
V. Nerve-muscle interaction
     A. Motor units
     B. Changes in motor units
     C. Other nerve-muscle interactions
VI. Blood flow in muscles
VII. Changes in muscle mass
     A. Effects of mass on strength
     B. Other effects
VIII. Muscle system performance - aspects and changes
     A. Reaction time and speed of movement
     B. Skill
     C. Stamina
          1. Four Aspects
          2. VO2 max - aerobic capacity
          3. Consequences of lowered VO2 max
IX. Staying physically active
     A. Interaction with age changes
     B. Specific effects on body systems
          1. Muscle mass
          2. VO2 max
     C. Overview
X. Starting or increasing exercise
     A. Justification
     B. Effects
          1. Circulatory system
          2. Respiratory system
          3. Nervous system
          4. Muscle system
          5. Skeletal system
          6. Endocrine system
          7. Other effects
XI. Exercise recommendations
     A. Body adaptability
     B. Set goals
     C. Evaluate and individualize
     D. Plan a program
     E. Minimize problems
     F. Consider alternatives
XII. Driving motor vehicles
     A. Accident rates
     B. Contributing factors
     C. Compensatory recommendations
 

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