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this muscle type is found in the walls of organs thus maintaining the internal environment with slow sustained contractions
Head of Mysoin
associated with ATPase, bonding site for ATP, interacts with actin, forms cross bridges
To Contract A Muscle
Stimulate neuron, Increase calcium, propagate electrical current along sarcolemma
Roles of ATP During Contraction
energy, release crossbridges, brings intracellular calcium back into the sarcoplasmic reticulum
Ways to Stop Contraction
No nerve impulses, Ach-ase, remove calcium, block myosin binding site, ATP binds to myosin head, ATPase inhibition
period where you would find excitation contraction coupling & Release of calcium in response to nerve stimulation
no relaxation (additive effects of calcium), Maximum frequency reached, no more increase in tension
stimuli from one source, 2nd stimulus arrives after refractory period, before end of relaxation; 2nd contraction is greater than 1st (more calcium)
muscle shortens during contraction, muscle tension is greater than load thus there is movement
tension increases but muscle doesn't shorten; load is greater than muscle thus there is no movement
Ways to Generate More ATP
creatine phosphate, glycolysis, oxidative phosphorylation (aerobic respiration)
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