Practice 1: Muscle Structure

Front

What is a myofilament?

Back

A myofilament is a filament that constitutes myofibrils, which are the basic units of muscle contraction. The two main types are actin (thin filaments) and myosin (thick filaments).

Front

What is the function of actin in muscle structure?

Back

Actin is a protein that forms thin filaments in muscle fibers and plays a crucial role in muscle contraction by interacting with myosin.

Front

What is the epimysium?

Back

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

Front

What is the perimysium?

Back

The perimysium is a connective tissue that surrounds bundles of muscle fibers, known as fascicles, providing support and pathways for nerves and blood vessels.

Front

What is the endomysium?

Back

The endomysium is a thin layer of connective tissue that surrounds each individual muscle fiber, providing support and facilitating the exchange of nutrients and waste.

Front

What is a fascicle in muscle structure?

Back

A fascicle is a bundle of muscle fibers (cells) grouped together within a muscle, surrounded by perimysium.

Front

What connects skeletal muscle to bone?

Back

Tendons connect skeletal muscle to bone, allowing for the transmission of force during muscle contraction.

Front

What is the role of myofibrils in muscle fibers?

Back

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

Front

What are sarcomeres?

Back

Sarcomeres are the basic functional units of striated muscle tissue, defined as the segment between two Z lines, where muscle contraction occurs.

Front

What is the difference between ligaments and tendons?

Back

Ligaments connect bone to bone, providing stability to joints, while tendons connect muscle to bone, facilitating movement.