Sliding Filament Theory

The smallest functional/contractile unit of skeletal muscle is called...

• Sarcoplasm

• Sarcomere

• myofiber

• Sarcolemma

What are the thin myofilaments of a sarcomere called?

• Tropomyosin

• Myosin

• Troponin

• Actin

What are the thick myofilaments in a sarcomere called?

• Tropomyosin

• Troponin

• Myosin

• Actin

Calcium ions bind to which of the following to expose the myosin binding sites?

• Troponin

• Tropomyosin

• Actin

• Terminal Cisternae

What is created when you hydrolyze (break down) ATP?

• ADP and a PO₄ (inorganic phosphate)

• AMP and ADP

• glycolysis

• the release of calcium

What is released during the power stroke phase of the sliding filament theory?

• ATP

• AMP

• Inorganic phosphate

• ADP

What is required to detach the myosin head from the myosin binding site?

• ATP

• ADP

• Inorganic phosphate

• Calcium ions

The muscle relaxes when _______ is returned to the __________.

• calcium; t-tubule

• calcium; endoplasmic reticulum

• calcium; motor end plate

• sodium; endoplasmic reticulum

Once Troponin returns to its normal location, Tropomyosin can also return to its location - covering the actin for the myosin to attach

• False

• True