class notes 3.31 - Biology 1006 Tetny strained contraction...

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Biology 1006: 3/31/10 Tetny: strained contraction of muscles Attached to skeleton: movement of tendons Under voluntary control Striated or striped appearance: generally red or black colored because of the pigment Myoglobin which stores oxygen for muscle use. Red muscles for sustained muscle use o More myoglobin (muscles are more red in color) when they are used more Most prominent bands are the z bands In between the z bands are sarcomeres When muscle contracts, the distance between the sarcomere and the z bands gets smaller Posture Muscles: alternative fibers firing contracting Fatigue in striated muscles (red muscles): o Aerobic- muscles are supplied with sufficient oxygen form the blood supply. Breathing rate and heart rate increase to supply oxygen (routine activity) o Sustained or repeated muscle contractions exceed the capacity of the body to supply oxygen from the hemoglobin. Oxygen is then obtained from oxygen reserves stored in Myoglobin. The most aerobic muscles have more myoglobin.
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