Skeletal Muscle Organization & Myogenesis

What is a fascicle?

A bundle of muscle fibers

What is a muscle fiber?

A single muscle cell

What is another name for a muscle fiber?

Myocyte

What is a myofibril?

Contractile structure inside a muscle fiber

What are myofilaments?

Actin and myosin filaments

Which filament is thin?

Actin

Which filament is thick?

Myosin

What is a sarcomere?

Basic contractile unit of muscle

What marks the boundaries of a sarcomere?

Z discs

What stores Ca2+ in muscle fibers?

Sarcoplasmic reticulum

What is myogenesis?

Formation of muscle tissue

What are myoblasts?

Developing muscle precursor cells

What forms when myoblasts fuse?

Myotubes

What do satellite cells help with?

Muscle repair and regeneration