Muscle Review

Front

What is the basic contractile unit of a muscle fiber?

Back

Sarcomere

Front

What are the two main types of filaments in muscle contraction?

Back

Actin (thin filament) and Myosin (thick filament)

Front

What is the role of myofibrils in muscle fibers?

Back

Myofibrils are the organelles responsible for muscle contraction.

Front

What theory explains how muscles contract?

Back

The sliding filament theory.

Front

What type of muscle tissue is involuntary and striated?

Back

Cardiac muscle.

Front

Where is smooth muscle primarily found in the body?

Back

In the walls of hollow organs, such as the digestive system.

Front

What is the primary function of skeletal muscle?

Back

To facilitate voluntary movement of the body.

Front

What is the role of mitochondria in muscle fibers?

Back

Mitochondria provide energy for muscle contractions through ATP production.

Front

What is the difference between voluntary and involuntary muscle?

Back

Voluntary muscle is controlled consciously (skeletal), while involuntary muscle operates automatically (smooth and cardiac).

Front

What is the Z line in a sarcomere?

Back

The Z line marks the boundary between adjacent sarcomeres and anchors the actin filaments.