Muscle Quiz

A muscle end attached to a less movable or relatively fixed part is called the __________.

• symphysis
• articulation
• origin
• insertion

Which of the following correctly pairs a term with its definition?

• Extension—bending the leg at the knee to bring the heel closer to the buttocks
• Abduction—lifting the arm out to the side of the body so that it is parallel to the ground
• Flexion—bringing the arm from overhead back down to the side of the body
• Adduction—moving the arm forward so its is in front of the body

What is a function of muscles?

• pumping blood
• generating electrical impulses
• storage of minerals
• cushioning tissues from blunt force

What is the name of the outermost layer of connective tissue surrounding a skeletal muscle?

• epimysium
• perimysium
• endomysium
• sarcolemma

Which statement describes a sarcomere?

• a segment of the sarcoplasmic reticulum
• a group of fascicles
• a group of muscle fibers
• a segment of the muscle fiber

Which of these options lists the structures in order, from smallest to largest?

• Myofibril, filament, muscle, fascicle, muscle fiber
• Fascicle, filament, muscle fiber, myofibril, muscle
• Filament, myofibril, muscle fiber, fascicle, muscle
• Filament, muscle fiber, myofibril, fascicle, muscle

Which of these options lists the structures in order, from deepest to most superficial?

• Perimysium, epimysium, endomysium, fascia
• Fascia, endomysium, perimysium, epimysium
• Fascia, epimysium, perimysium, endomysium
• Endomysium, perimysium, epimysium, fascia

What binds to the exposed cross-bridges on actin?

• ATP
• myosin
• calcium
• acetylcholine

What occurs at a neuromuscular junction?

• Actin and myosin filaments slide past one another.
• Troponin and tropomyosin cover and uncover actin binding sites.
• Neurotransmitters are released.
• Calcium channels open when calcium ions bind to them.

Which statement describes the mechanism of muscle contraction?

• Tropomyosin molecules move and expose specific binding sites on thick filaments.
• Actin filaments slide along myosin filaments.
• Cross-bridges form between actin and the sarcolemma.
• Filaments of troponin and tropomyosin slide past one another.