Muscle Types and Contraction Mechanisms Quiz

What is the structural unit of skeletal muscle?

• Myofibril

• Myoblast

• Sarcolemma

• Muscle Fiber

Which component is responsible for the striated appearance of skeletal muscle?

• Thin filament

• Thick filament

• I band

• A band

What role does calcium play in muscle contraction?

• Decreases muscle tension

• Activates Troponin

• Prevents cross-bridge formation

• Inhibits Troponin

What is the primary structural component of the actin filament?

• Tropomyosin

• Troponin

• Calcium

• Actin

What mechanism describes the process of muscle contraction?

• Calcium release

• Cross-bridge cycling

• Sliding filament mechanism

• Power stroke

Where is calcium stored in skeletal muscle cells?

• Nucleus

• Sarcoplasmic reticulum

• Mitochondria

• Cytoplasm

What is the function of tropomyosin in muscle contraction?

• Forms thick filaments

• Facilitates ATP hydrolysis

• Blocks binding sites on actin

• Binds to calcium

Which of the following is NOT a type of muscle based on control?

• Striated muscle

• Cardiac muscle

• Skeletal muscle

• Smooth muscle

What is the primary function of troponin in muscle contraction?

• Stabilizes actin

• Binds calcium

• Forms cross-bridges

• Releases ATP

What happens during the power stroke of muscle contraction?

• ATP is synthesized

• Actin filaments slide past myosin

• Myosin heads detach

• Calcium is released