Front

What is the energy molecule required for muscle contraction?

Back

ATP (Adenosine Triphosphate) is the energy molecule needed for muscle contraction.

Front

Which ion diffuses in the cytoplasm to facilitate muscle contraction?

Back

Calcium ions (Ca+) diffuse in the cytoplasm between myosin and actin, causing them to slide into each other.

Front

What is produced when ATP is broken down to release energy for muscle contraction?

Back

When ATP is broken down, it produces ADP (Adenosine Diphosphate) and inorganic phosphate (P).

Front

What are the components of the thin band in muscle fibers?

Back

The thin band includes actin, troponin, and tropomyosin, but not myosin.

Front

What is the thick band in muscle fibers known as?

Back

The thick band with heads is known as myosin.

Front

What role does ATP play in muscle contraction?

Back

ATP provides the energy necessary for the myosin heads to attach to actin and perform the power stroke.

Front

What is the function of troponin in muscle contraction?

Back

Troponin binds to calcium ions and helps regulate the interaction between actin and myosin.

Front

What is the role of tropomyosin in muscle fibers?

Back

Tropomyosin blocks the binding sites on actin, preventing muscle contraction until calcium ions bind to troponin.

Front

How does calcium ion concentration affect muscle contraction?

Back

An increase in calcium ion concentration in the cytoplasm triggers muscle contraction by allowing myosin to bind to actin.

Front

What is the sliding filament theory?

Back

The sliding filament theory explains how muscle contraction occurs through the sliding of actin and myosin filaments past each other.