Muscular System Review

Front

What is the primary function of the triceps brachii muscle?

Back

The triceps brachii muscle primarily extends the elbow joint.

Front

What is the role of the rectus abdominis in the muscular system?

Back

The rectus abdominis helps flex the spine and stabilize the pelvis.

Front

Define actin in the context of muscle contraction.

Back

Actin is a thin contractile protein that interacts with myosin to facilitate muscle contraction.

Front

What is rigor mortis and what causes it?

Back

Rigor mortis is the stiffening of muscles after death due to a lack of ATP, preventing the breakdown of cross-bridge bonds.

Front

Explain the sliding filament theory in muscle contraction.

Back

The sliding filament theory states that muscle contraction occurs when actin filaments slide past myosin filaments, shortening the muscle fiber.

Front

What is the function of myosin in muscle contraction?

Back

Myosin is a thick contractile protein that interacts with actin to produce muscle contraction.

Front

What are the external obliques and their function?

Back

The external obliques are muscles located on the sides of the abdomen that help rotate and flex the trunk.

Front

What is muscular dystrophy?

Back

Muscular dystrophy is a group of genetic disorders characterized by progressive muscle weakness and degeneration.

Front

What is the role of tropomyosin in muscle contraction?

Back

Tropomyosin is a protein that blocks the binding sites on actin, preventing muscle contraction until calcium ions are present.

Front

What is the significance of ATP in muscle contraction?

Back

ATP provides the energy required for muscle contraction and relaxation, including the breaking of cross-bridge bonds.