Microscopic Muscle Anatomy

The Light I Band consists of... 

• Myosin filaments only
• Actin filaments only
• Myosin and actin filaments
• none of the above

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

The ________ stores and releases Ca²⁺ to stimulate muscles.

• 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

Which of the following muscle types is NOT striated?!

• Smooth
• Skeletal 
• Cardiac
• All of the above are striated

Used to create energy for the muscle cell

• nuclei

• mitochondria

• T- tubules

• myofibrils

• myosin

Tags

NGSS.HS-LS1-7

Tubes that connect the sarcolemma to the sarcoplasmic reticulum

• nuclei

• mitochondria

• T- tubules

• myofibrils

• myosin

Contractile unit in myofibrils

• sarcolemma

• sarcoplasma

• sarcoplasmic reticulum

• sarcomere

• actin