Muscles and Movement

Front

What triggers the binding of myosin to actin?

Back

Calcium.

Front

What is the structure labeled #5 in a muscle diagram?

Back

Myofibril.

Front

What type of muscle tissue is characterized by involuntary contractions and is found in the heart?

Back

Cardiac muscle.

Front

Which ions are responsible for removing Troponin from Tropomyosin?

Back

Calcium ions.

Front

Calcium binds to which part of the troponin-tropomyosin complex?

Back

Troponin.

Front

What is the role of ATP in muscle contraction?

Back

ATP provides the energy required for myosin to bind to actin and perform the power stroke.

Front

What is the function of the endomysium?

Back

The endomysium surrounds individual muscle fibers, providing support and insulation.

Front

What is the difference between skeletal and smooth muscle tissue?

Back

Skeletal muscle is striated and under voluntary control, while smooth muscle is non-striated and involuntary.

Front

What is the role of tropomyosin in muscle contraction?

Back

Tropomyosin blocks the binding sites on actin, preventing contraction until calcium binds to troponin.

Front

What is the epimysium?

Back

The epimysium is a connective tissue layer that surrounds the entire muscle.