Sliding Filament Theory

___are regulatory proteins that cover the myosin binding site on the actin.

• troponin-tropomyosin

• sarcomere

• sarcolemma

• sarcoplasmic reticulum

slides inward during muscle contraction.

• actin

• myosin

What happens to the H zone and I Band during contraction?

• They grow in size

• They stay the same

• They shrink in size

Whats happens to the A band during contraction?

• It grows in size

• It stays the same

• It shrinks in size

What binds to the Myosin Head to cause it to detach from the Actin?

• ATP

• ADP

• CNS

• ETC

The Z Line provides attachment for the ...

• Troponin

• Myosin

• Actin

• ATP

True or False: Myosin-Heads act as a ATPase.

• True

• False

___forms a crossbridge with actin.

• actin

• myosin

• calcium

• ATP

When calcium binds to troponin, it causes tropomyosin to move, exposing binding sites on actin? What happens immediately after this step?

• ADP is released from the myosin heads

• Myosin heads attach to the exposed binding sites on actin

• Calcium is resorbed into the sarcoplasmic reticulum

• Myosin heads release from the binding sites on actin

What happens immediately after strong binding of myosin heads to the binding sites on actin?

• Calcium is resorbed into the sarcoplasmic reticulum

• Hydrolysis of ATP

• Troponin-tropomyosin go back to their original position

• Phosphate is released from the myosin heads