Muscles are wrapped in a connective tissue called ...

• Epimysium
• Perimysium
• Endomysium

Muscle cells are also called ...

• Muscle fibers
• Myofibrils
• Fascicles

Muscles are made of bundles of muscle fibers called ...

• Fascicles
• Myofibrils
• Tendons

The contractile protein fibers inside of muscle cells are called ...

• Myofibrils
• Sarcolemma
• Fascicles

Muscle cells appear striated because of their ...

• Dark and light bands
• Z discs and M lines
• Thick and thin filaments

Sarcomeres _____ during contraction.

• Shorten
• Lengthen
• Do not change

The contractile units of muscle fibers are called ...

• Sarcomeres
• Myofibrils
• Z discs
• A and I bands

Sarcomeres are separated by a ____.

• Z disc
• M line
• H zone
• A band

Which filament within a myofibril are anchored to the Z disc?

• Thin filaments
• Thick filaments

Which filament within a myofibril are attached to the M line?

• Thin filaments
• Thick filaments