Practice 1: Muscle Structure

Front

What is a sarcomere?

Back

A sarcomere is the basic structural and functional unit of a muscle fiber, composed of myofilaments (actin and myosin) that contract to produce muscle movement.

Front

What surrounds a muscle?

Back

A muscle is wrapped in a connective tissue layer called the epimysium.

Front

What is a fascicle?

Back

A fascicle is a bundle of muscle fibers (myocytes) surrounded by a connective tissue layer called the perimysium.

Front

Which is the smallest unit of muscle structure?

Back

The sarcomere is the smallest unit of muscle structure.

Front

What wraps around a muscle fiber?

Back

A muscle fiber is wrapped in a connective tissue layer called the endomysium.

Front

What are myofilaments?

Back

Myofilaments are the filaments of myofibrils, composed mainly of actin and myosin, responsible for muscle contraction.

Front

What is the function of the epimysium?

Back

The epimysium protects the muscle and allows it to function independently from surrounding tissues.

Front

What is the role of the perimysium?

Back

The perimysium surrounds fascicles and provides support and protection, as well as pathways for nerves and blood vessels.

Front

What is the difference between myocytes and myofibrils?

Back

Myocytes are individual muscle cells, while myofibrils are long, thread-like structures within myocytes that contain the myofilaments.

Front

What is the significance of the endomysium?

Back

The endomysium provides a supportive environment for individual muscle fibers and facilitates the exchange of nutrients and waste.