PHSL 3051 Lecture Notes - Lecture 13: Atp Hydrolysis, Sarcomere, Skeletal Muscle
Document Summary
Rigor mortis: muscles become stiff after death. Myosin is connected to actin and there is no atp to release it. Proteins begin to break up, breaking up the myosin and actin. Synapse between a somatic motor neuron and a skeletal muscle fiber. Nerve axon terminal communicates with the motor end plate by releasing acetylcholine (ach) Motor end plate: a specialized region of the muscle cell membrane containing ach receptors. Binding ach to the muscle receptors results in an end plate potential (epp) which triggers a muscle cell action potential. Epp local depolarization of the motor endplate (local action potential only) Muscle action potential is propagated along the sarcolemma of the entire muscle cell. Many active zones: places on membrane where the vesicles will most likely dock. Nmj tends to be in the center of the muscle cell. Runs simultaneously to both ends at the same time.
