Rigor mortis is the stiffening of the muscles several hours after death. The calcium that is released from the sarcolemma has locked onto the myosin heads allowing it the cross bridge to connect indefinitely. The ATP that unlocks the head from the actin is no longer available after three to five hours after death. Eventually, as the muscles will degrade after 48 hours after death the actin and myosin.
2. Length-tension relationship states the amount of the tension generated by the contraction of the muscle will vary on the length of the muscles at rest. The beginning and end of a contraction will be considered a weak-contraction or too stretched which means the myosin is to close to the Z-discs or the myosin overlaps which does not allow a correct cross-bridge to occur. When the contraction is at regular resting length will produce the greatest force when muscles contract. …show more content…
Twitch is a single muscle fiber stimulated briefly that produces a quick contraction and relaxation, but not enough to do any full muscle movement. The first phase is called the lag phase as a stimulation occurs, a brief 2 millisecond lag between stimulus and contraction as the calcium is being released from the SR. The second contraction phase occurs the muscle cell shortens, and external tension is visible. The third and final phase is the relaxation phase causes the tension decreases and the calcium is drawn back into the SR.
4. Wave summation occurs with the muscle are stimulated rapidly without rest in-between the stimulus. The failure to remove the calcium before each stimulus causing the calcium to build up in the sarcoplasm and creating multiple power stroke of the myosin and actin. The MMU, the multiple motor neuron, is a stimulation of a whole group of muscle nerves. More motor units and neurons are used and needed for the intensity of stronger contractions. The body uses both wave summation and multiple motor unit at different times as needed
2. Length-tension relationship states the amount of the tension generated by the contraction of the muscle will vary on the length of the muscles at rest. The beginning and end of a contraction will be considered a weak-contraction or too stretched which means the myosin is to close to the Z-discs or the myosin overlaps which does not allow a correct cross-bridge to occur. When the contraction is at regular resting length will produce the greatest force when muscles contract. …show more content…
Twitch is a single muscle fiber stimulated briefly that produces a quick contraction and relaxation, but not enough to do any full muscle movement. The first phase is called the lag phase as a stimulation occurs, a brief 2 millisecond lag between stimulus and contraction as the calcium is being released from the SR. The second contraction phase occurs the muscle cell shortens, and external tension is visible. The third and final phase is the relaxation phase causes the tension decreases and the calcium is drawn back into the SR.
4. Wave summation occurs with the muscle are stimulated rapidly without rest in-between the stimulus. The failure to remove the calcium before each stimulus causing the calcium to build up in the sarcoplasm and creating multiple power stroke of the myosin and actin. The MMU, the multiple motor neuron, is a stimulation of a whole group of muscle nerves. More motor units and neurons are used and needed for the intensity of stronger contractions. The body uses both wave summation and multiple motor unit at different times as needed