Date post: | 16-Dec-2015 |
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The Muscular System
Muscles Facts• Are there more muscles or bones?– Muscles (around 640)
• Each lb of muscle burns 75-100 calories a day just by being
Muscles Facts (cont.)
• Approximately 40% of your body weight is muscle
• Largest muscle = gluteus maximus
Muscles Facts (cont.)
• Smiling uses 17 muscles
• Frowning uses 43 muscles
Muscle Basics
• Muscles are made of bundles of protein fibers
Types of Muscle1. Skeletal muscle• attached to bones of skeleton
• Voluntary(we control them)
most of the meat we eat is this tissue
Types of Muscle (cont)
2. Cardiac muscle• found only in heart• not connected to bone
• involuntary (we don’t control)
Types of Muscle (cont.)
3. Smooth muscle• found in organs & blood vessels
• not connected to bone• involuntary
Muscular System Problems
• Strain: tearing of fibers
• Cramp: not enough oxygen, overuse
• Muscular Dystrophy: nerve messages to muscles are blocked
Steroids• Increase rate of muscle growth
• Stop bone growth• Side Effects: Heart attack, shriveled testes, etc.
Exercise & Muscles• When muscles are not used the cells become smaller & weaker
• Two main types of exercise: aerobic & anaerobic
Aerobic Exercise• Oxygen used rapidly by muscles
Uses slow twitch muscle• Glucose broken down• Ex: swimming & jogging
Anaerobic Exercise• High intensity Uses fast twitch muscle• Glucose converted to lactic acid (muscle burn)
• Ex: sprinting & weight lifting