Anatomy and Physiology 10 Chapter

Which muscle is responsible for abducting, flexing, and rotating the arm?

• Latissimus dorsi

• Trapezius

• Sartorius

• Deltoid

What is the function of the Latissimus dorsi muscle?

• Raises and lowers the shoulders

• Elevates the ribs during inspiration

• Adducts the humerus and extends the upper arm backward

• Flexes the lumbar region of the spinal cord

Which muscle is known as the prime mover when extending the forearm?

• Biceps Brachii

• Rectus abdominis

• Triceps brachii

• Gluteus Maximus

What are fascicles in the context of muscle structure?

• Connective tissue that surrounds the muscle as a whole

• The longest muscle in the body

• Groups of muscle fibers

• Protein bundles that consist of finer fibers

Which of the following is the connective tissue that surrounds the muscle as a whole?

• Perimysium

• Epimysium

• Endomysium

• Myofilaments

What are the units of contraction in a muscle called?

• Myofibrils

• Myofilaments

• Fascicles

• Sarcomeres

According to the sliding-filament model of contraction, what role do the myosin heads play during muscle contraction?

• They slide the actin myofilaments away from the center of the sarcomere

• They pull the Z disks closer together

• They propel the actin myofilaments toward the center of the sarcomere

• They break down ATP to release energy

Besides ATP, what else is required for muscle contraction?

• Oxygen

• Calcium

• Glucose

• Sodium

Which statement correctly describes the sequence of events in muscle contraction?

• Acetylcholine (ACh) is broken down before it diffuses across the synaptic cleft

• The release of acetylcholine (ACh) is triggered after the muscle contracts

• An impulse triggers the release of acetylcholine (ACh), which diffuses across the synaptic cleft

• Acetylcholine (ACh) diffuses back into the nerve terminal after muscle contraction

What is the continuous state of partial contraction that allows you to stand and hold your head up called?

• Muscle Relaxation

• Muscle Tone

• Muscle Spasm

• Muscle Fatigue