Sliding Filament Theory

Front

What is another name for a muscle cell?

Back

Fiber

Front

What extends from one Z line to another Z line?

Back

Sarcomere

Front

What organelle contains actin and myosin?

Back

Myofibril

Front

What two chemicals are necessary for muscle contraction to occur?

Back

Calcium and ATP

Front

What state is the sarcomere in when relaxed?

Back

Relaxed

Front

What is the basic unit of a muscle contraction?

Back

Sarcomere

Front

What is the role of calcium in muscle contraction?

Back

Calcium binds to troponin, causing tropomyosin to move and expose binding sites on actin.

Front

What is the function of ATP in muscle contraction?

Back

ATP provides the energy required for the myosin heads to detach from actin and re-cock for the next contraction.

Front

What is the structure that surrounds each muscle fiber?

Back

Sacrolemma

Front

What is the functional relationship between actin and myosin?

Back

Actin and myosin interact to produce muscle contraction through the sliding filament mechanism.