.Muosin releese Hint: see Fig. 12.16 in your textbook for help with this problem
ID: 3164973 • Letter: #
Question
.Muosin releese Hint: see Fig. 12.16 in your textbook for help with this problem.) 2.1. Draw a graph of a muscle twitch (make sure to label the axes!). Indicate when (on the x-axis) the motor neuron that controls this motor unit fired an action potential. 2.2 Label the three phases of the muscle twitch you drew in part 1 and (below your graph) describe the major molecular events that occur inside a muscle fiber during each of the three phases. 2.3 Extend the graph you drew above to show what would happen to the tension generated by this motor unit if the motor neuron controlling this motor unit fired action potentials with greater and greater frequency.Explanation / Answer
Adenosine triphosphate (ATP) is split into adenosine diphosphate (ADP) and phosphate to supply the energy for muscle contraction. The free energy released by the ATP when the phosphate is split off is transferred to the heads on the myosin filaments.
Myosins are a superfamily of motor proteins best known for theirroles in muscle contraction and in a wide range of other motility processes in eukaryotes. They are ATP-dependent and responsible for actin-based motility.
medical Definition of crossbridge. : the globular head of a myosin molecule that projects from a myosin filament in muscle and in the sliding filament hypothesis ofmuscle contraction is held to attach temporarily to an adjacent actin filament and draw it into the A band of a sarcomere between the myosin filaments.
ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site. ATP can then attach to myosin, which allows the cross-bridge cycle to start again; further muscle contraction can occur.
an ATP molecule binds to the actin molecule. an ATP molecule breaks down on themyosin head. an ATP molecule breaks down on the actin molecule. ADP and phosphate bind to the myosin head.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.