Muscle movement Flashcards
Excitation-contraction coupling
How an action potential causes contraction of a muscle fiber
What is stored in teh sarcoplasmic reticulum?
Ca2+?
What does Ca2+ bind with?
Tropin
What is the function of the T tubules?
They carry action potentials into the interior of muscle fiber and cause voltage-gated Ca2+ channels to open
Cross bridge-movement
the cycle of a myosin molecule of forming the bridge, movement, release, and return to its original position
How much energy is required for each cycle of cross-bridge formation
One ATP molecule
Spastic paralysis
muscles contracting and not relaxing
What molecule is integral to the transmission of action poetntials?
Acetylcholine
Power stroke
Movement of the myosin molecule while the cross-bridge is attached
Recovery stroke
return of myosin head to its original position
when does Muscle relaxation occur?
when acetylcholine is no longer released at the neuromuscular junction
3 ATP events required for muscle relaxation
1) Sodium potassium pump transports Na+ and K+ to return to and maintain resting membrane potential
2) ATP detaches mysoin heads form actin
3) ATP actively transports Ca2+ into sarcoplasmic reticulum
