Skeletal Muscle Anatomy Practice

Front

What is a muscle fiber?

Back

A muscle fiber is a single cylindrical cell that makes up skeletal muscle, containing myofibrils and responsible for muscle contraction.

Front

What is the M Line in a sarcomere?

Back

The M Line is the middle line of the sarcomere that anchors the thick filaments (myosin) and is located in the center of the A band.

Front

What does the Z Line represent in a sarcomere?

Back

The Z Line is the boundary between adjacent sarcomeres and anchors the thin filaments (actin).

Front

List the structures of a muscle from smallest to largest.

Back

myofibril, muscle fiber, fascicle, muscle.

Front

What is a fascicle?

Back

A fascicle is a bundle of muscle fibers surrounded by perimysium, forming a part of a skeletal muscle.

Front

What is the role of the epimysium?

Back

The epimysium is a connective tissue layer that surrounds the entire muscle, providing protection and support.

Front

Define myofibril.

Back

Myofibrils are long, thread-like structures within muscle fibers that contain the contractile proteins actin and myosin.

Front

What is the function of the sarcomere?

Back

The sarcomere is the basic contractile unit of muscle tissue, responsible for muscle contraction through the sliding filament mechanism.

Front

What are the main components of a sarcomere?

Back

The main components of a sarcomere include the Z Line, M Line, A Band, I Band, thick filaments (myosin), and thin filaments (actin).

Front

What is the difference between the A Band and I Band in a sarcomere?

Back

The A Band contains the entire length of thick filaments (myosin) and overlaps with thin filaments, while the I Band contains only thin filaments (actin) and is lighter in appearance.