Muscle Anatomy Quiz

What does the term “origin” refer to?

• The attachment to the movable bone

• The attachment to the stationary bone

• The process of muscle contraction

• The connection between two bones

What is the function of the insertion of a muscle?

• To stabilize the joint

• To attach to the stationary bone

• To attach to the movable bone

• To generate heat

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

• Producing body movements

• Stabilizing body positions

• Conducting nerve impulses

• Generating heat

What is the sarcolemma?

• The cytoplasm of a muscle fiber

• The plasma membrane of a muscle cell

• A protein involved in muscle contraction

• The outer covering of a muscle

What structure conducts excitatory signals in muscle tissue?

• Sarcoplasmic reticulum

• Sarcolemma

• Transverse (T) tubules

• Myofibrils

What does the sarcoplasm contain?

• ATP and calcium

• Myoglobin and glycogen

• Actin and myosin

• Synovial fluid

Which process begins the sliding filament theory of muscle contraction?

• Calcium binding to troponin

• ATP hydrolysis by myosin heads

• Crossbridge formation between actin and myosin

• The release of calcium ions from the SR

What occurs during the “power stroke” of the contraction cycle?

• Myosin heads bind to ATP

• Myosin crossbridges rotate toward the sarcomere center

• Actin filaments detach from myosin

• Calcium ions are pumped back into the SR

Which of the following provides the fastest ATP generation for muscle contraction?

• Aerobic respiration

• Creatine phosphate system

• Anaerobic respiration

• Glycogen breakdown

Which protein blocks the binding sites on actin during muscle relaxation?

• Troponin

• Tropomyosin

• Myosin

• Actin