Microscopic Anatomy of Muscles and Energy Sources

Where does the initial amount of ATP for muscle contraction come from?

• Creatine Phosphate

• anaerobic glycolysis

• the muscles

• aerobic respiration

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

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

• M-Line
• H-Zone
• Z-Disc
• A-Band

Which of the following is NOT a function of the muscular system?

• Heat production
• Joint stability
• Movement
• Communication

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

Contractile unit in myofibrils

• sarcolemma

• sarcoplasma

• sarcoplasmic reticulum

• sarcomere

• actin