What are the 11 steps of muscle contraction?
Terms in this set (11)
- brain sends signal.
- acetylcholine is released from the synaptic vesicles.
- acetylcholine travels across the synaptic cleft and binds to receptor molecules.
- sodium ions diffuse into the muscle cell.
- calcium ions are released from the SR.
- calcium ions bind to actin and expose binding sites for myosin.
What are the 12 steps of muscle contractions?
Terms in this set (12)
- Motor neuron sends action potential (nerve impulse) to the muscle.
- acetylcholine (ACh) release from vesicles on motor neuron.
- ACh binds to receptors on muscle membrane & activates 2nd action potential, now on muscle.
- Action potential opens active transport pumps of sarcoplasmic reticulum.
What are the three phases of muscle contraction?
Muscle contractions have 3 different phases which include the latent period, contraction phase, and the relaxation phase (Silverthorn, D.U., 2010). The latent period occurs between the start of an action potential and the beginning of a muscle contraction (Stabler, et.al, 2009).
What stops a muscle contraction?
Muscle Relaxation. Once your muscle contracts, the space between the motor end plate and the fibers releases an enzyme called acetylcholinesterase, which ends the stream of action. This causes the muscle to stop contracting and begin relaxation.
What are the detailed steps for a muscle contraction?
Describe the important steps in muscle contraction. Muscle contraction is initiated by signals that travel along the axon and reach the neuromuscular junction or motor end plate. The generation of this action potential releases calcium ions from the sarcoplasmic reticulum in the sarcoplasm. The increased calcium ions in the sarcoplasm leads to the activation of actin sites.
Which step constitutes the power stroke of muscle contraction?
As the actin is pulled, the filaments move approximately 10 nm toward the M line . This movement is called the power stroke, as it is the step at which force is produced. As the actin is pulled toward the M line, the sarcomere shortens and the muscle contracts.