Muscular System

Front

What is the thin filament in muscle fibers composed of?

Back

Actin

Front

What is the thick filament in muscle fibers composed of?

Back

Myosin

Front

What two chemicals are necessary for muscle contraction to occur?

Back

Calcium and ATP

Front

How do muscles contract?

Back

Thin filaments slide past thick filaments.

Front

What happens to the elbow when the biceps muscle contracts?

Back

The elbow bends.

Front

What is the role of calcium in muscle contraction?

Back

Calcium ions trigger the interaction between actin and myosin.

Front

What is ATP and why is it important for muscle contraction?

Back

ATP (Adenosine Triphosphate) provides the energy required for muscle contraction.

Front

What is the sliding filament theory?

Back

The theory that explains how muscles contract by the sliding of actin and myosin filaments past each other.

Front

What is the function of the triceps muscle?

Back

The triceps muscle extends the elbow.

Front

What is the role of myosin in muscle contraction?

Back

Myosin heads bind to actin filaments and pull them to contract the muscle.