How do you explain muscle contraction?

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights. Muscle contraction is often followed by muscle relaxation, when contracted muscles return to their normal state.

What is the correct sequence for muscle contraction?

(A) Binding of myosin head to exposed active site of actin forming the cross-bridge by utilising the energy from hydrolysis of ATP. (B) Binding of Ca++ with troponin of actin filaments and thereby removing the masking of active sites for myosin.

What are the 12 steps of muscle contraction?

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 12 steps of muscle contractions?

Terms in this set (12)

  • Motor neurons release ACh into synapse.
  • ACh travels across the synapse and binds to ACh receptors on the sarcolemma.
  • Binding of ACh causes an action potential to spread across the sarcolemma and into the T-tubules.
  • Action potential causes the release of calcium ions from the sarcoplasmic reticulum.

What are the 13 steps of muscle contraction?

Terms in this set (13)

  • Action Potential reaches muscle.
  • AP crosses NMJ.
  • Depolarization of m. membrane.
  • AP travels down on muscle by T-Tybules to SR.
  • SR realeases Ca.
  • Ca Binds to TrC.
  • Exposure of Myosin binding site on Actin.
  • Myosin heads bind to Actin.

What are the steps of the contraction cycle?

the 4 steps of the contraction cycle:

  • ATP Hydrolysis.
  • Cross bridge attachment.
  • Power stroke.
  • Cross bridge detachment.

What step ends a contraction?

Muscle contraction usually stops when signaling from the motor neuron ends, which repolarizes the sarcolemma and T-tubules, and closes the voltage-gated calcium channels in the SR. Ca++ ions are then pumped back into the SR, which causes the tropomyosin to reshield (or re-cover) the binding sites on the actin strands.

What are the 14 steps to muscle contraction?

Terms in this set (14)

  1. Action potential arrives at axon terminal.
  2. Trigger voltage gated calcium channels.
  3. Calcium causes ACh to be released by exocytosis.
  4. ACh diffuses across junction.
  5. Influx of sodium to sarcolema.
  6. Action potential travels down sarcolema and into t-tubule.
  7. Calcium is released from sarcoplasmic reticulum.