Muscle anatomy

The functional unit of the muscle cell is the: 

• Sarcomere
• Osteon
• Myofilament
• Muscle fiber

The thick filament is composed of: 

• Myosin
• Actin

The thin filament is composed of: 

• Myosin
• Actin

Fill-in-the-blank! Muscle, Fascicle, _____, Myofibril

• Muscle fiber
• Myofilament
• Sarcomere
• Actin 

Actin filaments our bound to the edges of the sarcomere, also known as the...

• M-Line
• H-Zone
• Z-Disc
• A-Band

The ________ functions in regulation of Ca²⁺ levels. 

• Sarcoplasmic Reticulum
• T Tubules
• Mitochondria
• Fascicle

___ and ___ are regulatory proteins bound to actin. 

• Troponin and tropomyosin
• Myosin and actin
• Calcium and Oxygen
• Glycogen and hemoglobin

Membrane that covers several muscle fibers to form a bundle.

• Endomysium

• Epimysium

• Fascicle

• Perimysium

Tough connective tissue sheath that surrounds the entire muscle.

• Endomysium

• Epimysium

• Fascicle

• Perimysium

Found within sarcomeres and create the banding pattern.

• Fascicle

• Myofibril

• Myofilaments

• Sarcolemma