Muscle PhysioEx Lab Report t References Mailings Review View Help Tell me what y
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Muscle PhysioEx Lab Report t References Mailings Review View Help Tell me what you want to do Experiment 4: Isometric contraction Describe what is meant by an isometric contraction. (2 pts) Isometric contractions generate force without changing the length of the muscle. 1. Describe what happens to the length of sarcomeres inside a muscle as you lengthen the muscle itself? (2 pts) 2. 3. Explain what is happening inside a sarcomere as its length is altered that would affect the force of contraction? In other words, why do you see the change in force of contraction as you alter the sarcomere length? (2 pts) Experiment 5: Isotonic contraction 1. Define isotonic contraction. (2 pts) 2. Describe how the velocity (speed) of contraction changed with the weight that was applied to the muscle. (2 pts) Describe the effect you observed on velocity of contraction as the muscle length was increased. (2 pts) 3. Explain why there was such an effect (i.e., what is happening inside the sarcomere to account for this?) (2 pts)Explanation / Answer
Experiment 4:
1.Isometric exercise can be define as a type of strength training in which the joint angle and muscle length do not change during contraction (compared to concentric or eccentric contractions.
2.In the muscle at longer sarcomere lengths, overlapping between actin and myosin filaments are less. The maximal sarcomere length is approx 3.0 m. Further elongation of the muscle occurs by slippage of fibers and not by further sarcomere lengthening.
3. Change in the length of the sarcomere is occured during movements if lengthening of the muscle occurs the overlapping between the sarcomere is less while duringshortening the length of the sarcomere does not chnage.
Experiment 5:
1.An isotonic contraction can be define as concentrically, the muscle shortens as the fibres contract or eccentric, where the fibres contract as the muscle lengthens. When a muscle contracts with no resulting movement, it is an isometric contraction.
2. The speed of muscle contraction reduces as the weight appied on the muscle increases as it required more affort to maintain or hold the weight.when the load the muscle is required to lift decreases, contraction velocity increases
3.The resting muscle length increases, the more cross-bridges cycling occurs when muscles are stimulated to contract. The resulting tension increases.The increases in the tension that will be developed by the cardiac muscle and the velocity of muscular contraction at a given afterload will increase.
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