Muscle Action IB

Contractions are generated by

• shortening of thick filaments
• shortening of thin filaments
• sliding of thin filaments past thick filaments
• "accordian-like" folding of thick and thin filaments

The actin is represented by the letter

• A
• B
• C
• D

Calcium:

• causes ATP binding to actin
• increases the action potential along the sarcolemma
• binds to proteins on myosin
• triggers the binding of myosin heads to actin

attaches the muscle to the bone

• ligament
• cartilage

• synovial fluid

• tendon

When a muscle contracts, it _______

• gets longer
• gets shorter
• gets thinner
• grows hair

Which theory states that the muscle fibers shorten as the actin and myosin filaments pull on each other?

Covers the actin and prevents the myosin head to attach to the actin (rope or strand shape). 

• Tropomyosin

• Myosin and actin
• Tropinin

• Glycogen and hemoglobin

A sarcomere is

• A protein filament or fiber
• The basic contractile unit of muscle contraction
• An organelle
• An organ

The part of the sarcomere that A (green) refers to is the?

• Z Line
• M Line
• H Line
• A Line

The part of the sarcomere that C (Blue) refers to is the?

• Actin
• Myosin
• Troponin
• Tropomyosin