Skeletal and Smooth Muscle Quiz C

What is the H zone of a sarcomere?

• Area with only actin
• Area with only myosin
• Area with both actin and myosin
• Area with Z lines

Which protein is found in the I band?

• Myosin
• Actin
• Troponin
• Tropomyosin

Which ion triggers muscle contraction?

• Sodium
• Potassium
• Calcium
• Magnesium

Which neurotransmitter initiates muscle contraction?

• Dopamine
• Acetylcholine
• Serotonin
• Norepinephrine

What is realeased to degrade Acetylcholine at the end of a contraction?

• ATPase
• Acetylcholinesterase
• Creatine kinase
• Lactase

What is the smallest contractile unit of a muscle?

• Myofibril
• Fascicle
• Muscle fiber
• Sarcomere

Which structure connects muscle to bone?

• Epimysium
• Endomysium
• Perimysium
• Tendon

Which part of the sarcomere defines its boundaries?

• A band
• Z line
• H zone
• M line

Which filament is thick and golf-club shaped?

• Actin
• Myosin
• Troponin
• Tropomyosin

What is the role of troponin in muscle contraction?

• Blocks active sites
• Stores calcium
• Binds calcium and moves tropomyosin
• Breaks down ATP