During Muscle Relaxation the Sarcoplasmic Reticulum?
Muscle Contraction and Relaxation Are Regulated by the Intracellular Ca2+ Concentration (1–3). When a Muscle Fiber Is Excited, Ca2+ Is Rapidly Released from...
Muscle contraction and relaxation are regulated by the intracellular Ca2+ concentration (1–3). When a muscle fiber is excited, Ca2+ is rapidly released from the sarcoplasmic reticulum (SR) inducing muscle contraction. When Ca2+ is reaccumulated into the SR, the muscle relaxes.
What happens during muscle relaxation?
Relaxation: Relaxation occurs when stimulation of the nerve stops. Calcium is then pumped back into the sarcoplasmic reticulum breaking the link between actin and myosin. Actin and myosin return to their unbound state causing the muscle to relax.
What happens during the relaxation phase in muscle contraction?
When the muscle relaxes the tension decreases. This phase is called the relaxation phase. During this phase calcium is actively transported back into the sarcoplasmic reticulum using ATP. The troponin moves back into position blocking the myosin binding site on the actin and the muscle passively lengthens.
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