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What is present in the H zone?
Myosin only
What is present in the I band?
Actin only
What is present in the A band?
Myosin and Actin
Which band is the Z disc in?
I band
Name the parts of a muscle from largest to smallest
Muscle
Fascicle
Muscle fiber
Myofibril
Sarcomere
Myofilament
Which myofilament has heads on it?
Myosin
Which myofilament looks like beads?
ActinW
Why does myosin have heads?
Binding site for ATP and actin
What is actin anchored to?
Z disc
What does tropomyosin do?
Covers the binding sites for myosin on the actin