Muscle Contractions and Organization

What is the name of the thick myofilaments?

• Actin
• Myosin
• Myoglobin
• Titan

What is the name of the thin myofilaments in the muscle cell?

• Actin
• Myosin
• Myoglobin
• Titan

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 to actin

attaches the muscle to the bone

• ligament
• aponeurosis
• epimysium
• tendon

a bundle of muscle fibers

• actin
• mysoin
• fascicle
• sarcomere

When a muscle contracts, it _______

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

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

• threshold stimulus theory
• sliding filament theory
• neurotransmitter theory
• all or none principle

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

• tropomyosin
• Myosin and actin
• Calcium and Oxygen
• Glycogen and hemoglobin