| A | B |
|---|
| Fast-twitch fibers | Contain a relatively small number of mitochondria and high ATPase activity. |
| Endurance Athletes | Generally possess a high percentage of slow-twitch fibers. |
| Type II fibers | Contain a high concentration of anaerobic enzymes. |
| Exercise has been linked to: | Prevention of cancer, reduction of stress, relieving depression, an increases in HDL's. |
| Fiber recruitment generally occurs in which order? | ST, FOG, FGT. |
| The breakdown of ATP in muscle is accomplished via the enzyme: | ATPase |
| Sarcolemma | The cell membrane around muscle. |
| Actin and myosin | The two principle contractile proteins found in skeletal muscle. |
| Calcium binding to troponin. | The trigger to initiate the contractile process in skeletal muscle. |
| Overload | Stress the system above a level to which it's accustomed to. |
| Hypokinetic | Too little exercise. |
| H Zone | When the muscle is fully contracted this zone/band area completely disappears. |
| Epimysium | The outermost layer that surrounds the entire muscle. |
| Acute responses to exercise. | Increases in heart rate, blood pressure, temperature, and respiration. |
| Type I fibers | Skeletal muscle fibers that contain learge numbers of mitochondria and myoglobin and would likely be classified as slow-twitch. |
| Muscle atrophy | May be caused by limited physical activity. |
| Motor unit | The smallest functional unit of movement in muscle. |
| Ligaments | Connect bone to bone. |
| Tendons | Connect muscle to bone. |
| power stroke | A single muscle contraction cycle. |
