Muscles Review Quiz

Which of the following is the basic functional unit of a muscle?

• Myofibril

• Sarcomere

• Tendon

• Epimysium

What type of muscle tissue is under voluntary control?

• Smooth muscle

• Cardiac muscle

• Skeletal muscle

• Nervous tissue

Which ion is essential for muscle contraction?

• Sodium

• Potassium

• Calcium

• Chloride

What is the role of the sarcoplasmic reticulum in muscle cells?

• Transmitting nerve impulses

• Storing calcium ions

• Producing energy for muscle cells

• Protecting muscle fibers

During muscle contraction, myosin heads bind to which protein?

• Actin

• Tropomyosin

• Troponin

• Titin

What is the sliding filament theory?

• Explanation of how ATP is produced in muscle cells

• Description of how muscles grow with exercise

• Theory describing how myofilaments slide to produce muscle contraction

• Theory of how muscles communicate with the nervous system

Which connective tissue layer surrounds individual muscle fibers?

• Epimysium

• Perimysium

• Endomysium

• Fascia

Which muscle type is found in the walls of hollow organs?

• Skeletal

• Cardiac

• Smooth

What is the role of ATP in muscle contraction?

• Binds to troponin to expose binding sites

• Provides energy for the power stroke of myosin

• Releases calcium from the sarcoplasmic reticulum

• Forms the cross-bridge between actin and myosin

Which of the following is a characteristic of cardiac muscle?

• Multinucleated cells

• Non-striated appearance

• Intercalated discs

• Voluntary control