Muscular System Quiz

What is the function of intercalated discs in cardiac muscle tissue?

• D. They provide structural support

• C. They help in muscle relaxation

• B. They store energy for muscle cells

• A. They aid in muscle contraction

Where can smooth muscle tissue be found in the body?

• A. Brain and spinal cord

• D. Lungs

• B. Heart

• C. Digestive system

Which type of muscle tissue is involved in voluntary control?

• D. None of the above

• C. Skeletal muscle tissue

• B. Smooth muscle tissue

• A. Cardiac muscle tissue

What is the part of the bone that attaches to the muscle and is moved during muscle contraction called?

• B. Origin

• D. Antagonist

• A. Insertion

• C. Agonist

What is the main protein in thin filaments of a sarcomere?

• A. Myosin

• B. Actin

• C. Tropomyosin

• D. Troponin

What is the function of ATP in muscle contraction?

• D. It prevents the actin from slipping back to its original position

• C. It hydrolyzes to provide energy for myosin heads

• B. It binds to actin

• A. It helps in muscle relaxation

What regulatory protein blocks the myosin bonding sites on actin?

• D. Intercalated discs

• C. Troponin

• B. Myosin

• A. Tropomyosin

What triggers the release of calcium in muscle contraction?

• C. Troponin

• B. Neuron stimulation

• A. ATP

• D. Tropomyosin

What happens to the tropomyosin when calcium binds to troponin?

• A. It moves off the myosin bonding sites

• B. It binds to actin

• C. It hydrolyzes ATP

• D. It prevents muscle contraction

What is the main concept of the sliding-filament model of muscle contraction?

• A. The thick and thin filaments shorten

• B. The sarcomere lengthens during contraction

• C. The Z lines move further apart during contraction

• D. The thick and thin filaments slide past each other