Sliding filament theory

Front

What is the sliding filament theory?

Back

The sliding filament theory explains how muscles contract by the sliding of actin and myosin filaments past each other, leading to muscle shortening.

Front

What is the primary energy source for muscle contraction?

Back

ATP (Adenosine Triphosphate) is the only energy source that can be used to directly power muscle activity.

Front

What role does ATP play in muscle contraction?

Back

ATP binds to myosin, allowing it to detach from actin and reset for another contraction cycle.

Front

True or False: Myosin detaches from actin when ATP binds to myosin.

Back

True.

Front

What is the function of calcium ions (Ca2+) in muscle contraction?

Back

Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin.

Front

How does the sarcomere shorten during muscle contraction?

Back

The actin filaments are pulled by the myosin filaments, leading to the shortening of the sarcomere.

Front

What initiates the muscle contraction process?

Back

A nerve impulse triggers the release of calcium ions from the sarcoplasmic reticulum.

Front

What is a cross-bridge in muscle contraction?

Back

A cross-bridge is the connection formed between myosin heads and actin filaments during muscle contraction.

Front

What is the power stroke in muscle contraction?

Back

The power stroke is the movement of the myosin head that pulls the actin filament toward the center of the sarcomere.

Front

What happens to myosin after the power stroke?

Back

After the power stroke, ATP binds to myosin, causing it to detach from actin.