DHQ What does the word aerobic mean? * Hint- it is a type of exercise

How do muscles work and create movement? Muscles turn energy into motion Everything you do is expressed as muscular motion The basic action of any muscle is contraction A muscle is a bundle of cells called fibers A muscle fiber contains myofibrils, which are cylinders of muscle proteins The proteins allow a muscle cell to contract The contractions of all muscles are triggered by electrical impulses

Continued…… Muscles have a mixture of two basic types of fibers; 1. Fast twitch muscle fibers – capable of developing greater forces, contract faster, and have greater anaerobic capacity What are some anaerobic activities? What are some anaerobic activities? Slow twitch muscle fibers – develop force slowly, maintain contractions longer, and have higher aerobic capacity What are some aerobic activities? What are some aerobic activities?

Flexion Bending parts at a joint Examples:  Bending at the knee and elbow, bending head forward on the chest

Extension Straightening parts at a joint Examples: Straightening the leg, elbow, neck

Abduction Moving a limb away from the midline of the body. Example: Lifting the arm/leg horizontally away from the body

Adduction Moving a limb toward the midline of the body. Example: Returning the arm/leg from the horizontal position to the side of the body.

Rotation Moving a part around an axis. Example: Twisting the head from side to side and twisting the trunk from side to side