The organization of myosin in smooth and striated muscle:
The organization of myosin in smooth and striated muscle:
A.) differ because smooth muscle lacks sarcomeres
B.) is identical but the organization of actin is different
C.) is identical but the isoforms of myosin differ
D.) differ because striated muscle myosin forms filaments but smooth muscle myosin does not
ATP is required for:
a.) the phosphorylation of the myosin head in smooth muscle
b.) the movement of tropomyosin on the actin filament
c.) the swing of the myosin lever arm
d.) A and B
e.) tethering troponin I to troponin C
Smooth muscle consists of thick and thin filaments that are not arranged into sarcomere.In skeletal, the actin filaments are attached to Z plates, which hold many actin filaments and show up as dark bands under the microscope.Smooth muscle myosin forms filaments.
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