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Summary   contraction and relaxation
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Summary contraction and relaxation

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  • 1. 1. A WAVE of depolarization spreads equally across the surface of the sarcolemma in all directions.
  • 2. 2. The depolarization wave follows the surface of the transverse tubules which brings the it deep inside the muscle fiber and parallel to the terminal cisternae of the sarcoplasmic reticulum .
  • 3. 3. After the “signal” has completely depolarized the sarcolemma, it enters the sarcoplasmic reticulum .
  • 4. 4. When the depolarization wave hits the sarcoplasmic reticulum it causes the release of Ca +2 ions into the sarcoplasm .
  • 5. 5. Chemical cross bridges form between actin and myosin within the sarcomeres whenever Ca +2 ions are released into the sarcoplasm.
  • 6. 6. The cross bridges “ jump ” or “ ratchet ” down the myosin thus sliding the actin over the myosin .
  • 7. 7. This causes the sarcomere to shorten , thus the muscle is contracted .
  • 8. 1. A WAVE of depolarization spreads equally across the surface of sarcolemma in all directions. 2. The depolarization wave follows the surface of the transverse tubules which brings the it deep inside the muscle fiber and parallel to the terminal cisternae of the sarcoplasmic reticulum . 3. After the “signal” has completely depolarized the sarcolemma, it enters the sarcoplasmic reticulum . 4. When the depolarization wave hits the sarcoplasmic reticulum it causes the release of Ca +2 ions into the sarcoplasm . 5. Chemical cross bridges form between actin and myosin within the sarcomeres whenever Ca +2 ions are released into the sarcoplasm. 6. The cross bridges “ jump ” or “ ratchet ” down the myosin thus sliding the actin over the myosin . 7. This causes the sarcomere to shorten , thus the muscle is contracted .
  • 9. 1. A WAVE of depolarization spreads equally across the surface of sarcolemma in all directions. 2. The depolarization wave follows the surface of the transverse tubules which brings it deep inside the muscle fiber and parallel to the terminal cisternae of the sarcoplasmic reticulum. 3. After the “signal” has completely depolarized the sarcolemma, it enters the sarcoplasmic reticulum. 4. When the depolarization wave hits the sarcoplasmic reticulum it causes the release of Ca +2 ions into the sarcoplasm. 5. Chemical cross bridges form between actin and myosin within the sarcomeres whenever Ca +2 ions are released into the sarcoplasm. 6. These cross bridges “jump” or “ratchet” down the myosin thus sliding the actin over the myosin. 7. This causes the sarcomere to shorten , thus the muscle is contracted .
  • 10. 1. A WAVE of depolarization spreads equally across the surface of the sarcolemma (from the NMJ) in all directions. 2. The depolarization wave follows the surface of the transverse tubules which brings it deep inside the muscle fiber and parallel to the terminal cisternae of the sarcoplasmic reticulum. 3. After the “signal” has completely depolarized the sarcolemma, it enters the sarcoplasmic reticulum. 1. A WAVE of repolarization spreads equally across the surface of the sarcolemma (from the NMJ) in all directions. 2. The repolarization wave follows the surface of the transverse tubules which brings it deep inside the muscle fiber and parallel to the terminal cisternae of the sarcoplasmic reticulum. 3. After the “signal” has completely repolarized the sarcolemma, it enters the sarcoplasmic reticulum.
  • 11. 4. When the depolarization wave hits the sarcoplasmic reticulum it causes the release of Ca +2 ions into the sarcoplasm. 5. Chemical cross bridges form between actin and myosin within the sarcomeres whenever Ca +2 ions are released into the sarcoplasm. 6. The cross bridges “jump” or “ratchet” down the myosin thus sliding the actin over the myosin. 7. This causes the sarcomere to shorten , thus the muscle is contracted . 4. When the repolarization wave hits the sarcoplasmic reticulum it causes the absorption of Ca +2 ions from the sarcoplasm. 5. Chemical cross bridges break between actin and myosin within the sarcomeres whenever Ca +2 ions are absorbed from the sarcoplasm. 6. The cross bridges disappear thus sliding the actin back over the myosin. 7. This causes the sarcomere to lengthen , thus the muscle is relaxed .