Motor mechanisms II.

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Motor mechanisms II

How filaments slide Against each other

Review questions

Binding of ATP to myosin head causes: a) actin filament to slide b) Myosin head to detatch from actin filament C) Myosin head to cock

What will happen when ADP and Pi dissociate from myosin head? A) head will detatch from actin filament B) head will retract and pull actin filament C) head will bind ADP again

Ca++ induces muscle contraction by: A) Causing actin monomers to assemble into a filament B) making ATP available to bind to myosin head C) allowing myosin head to bind to actin filament

Muscle fiber types are the result of different types (isoforms) of myosin Type I - slow fibers (aerobic) Type II - fast fibers (anaerobic) Type IIx - very fast Type IIa - intermediate between II x and I

Characteristics of other muscle types: Cardiac muscle - found only in the heart, striated, gap junctions allow direct electrical signaling between cells Smooth muscle - involuntary muscle, meshwork of actin and myosin, can contract more (greater shortening), but with less tension.

Muscle cell types schematic: 1) skeletal 2) cardiac 3) smooth

Skeletal muscle

Cardiac muscle

Smooth muscle