Module #4 Exam: Muscles

How are slow twitch fibers and fast twitch fibers different?

• Slow twitch fibers contain a low amount of capillaries.

• Slow twitch fibers contain a low amount of mitochondria.

• Fast twitch fibers contain a high amount of myoglobin.

• Fast twitch fibers contain a high amount of glycolytic enzymes.

Which of the following represents a muscle group pair in the human body?

• biceps and trapezius

• hamstrings and gluteus

• rectus abdominis and erector spinae

• quadriceps and deltoid

Which of the following correctly lists structures in a muscle from largest to smallest?

• myofibrils, fascicles, actin

• fascicles, myofibrils, myosin

• actin, myosin, sarcomeres

• sarcomeres, myofibrils, actin

What is the definition for a static contraction?

• a contraction that develops a tension where the muscle length remains the same

• a contraction that develops a tension where the muscle length elongates

• a contraction that develops a tension where the muscle collapses

• a contraction that develops a tension where the muscle length shortens

Which action demonstrates increasing the resistance of a movement by lengthening the distance between the joint and the movement?

• doing a sit up with arms on the forehead after sitting up with arms behind head

• rising from a wide-leg squat after rising from a closed leg squat

• turning in a circle with arms against the body after turning with arms extended

• lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

Which of the following activities would have the highest excessive momentum?

How many different types of fibers do muscles have?

• three

• two

• four

• five

Which attachment is NOT a way muscles can be attached to bone?

• with a fibrous tissue

• with a tendon

• with a nerve ending

• directly to bone

When a muscle contracts in order to hold parts of the body steady and maintain a safe or stable position, it is acting as a

• synergist.

• agonist.

• fixator.

• antagonist.

Which statement best defines a motor unit?

• single nerves found in each muscle

• a nerve supplying a muscle originating from the spinal cord

• a motor nerve and the muscle cells it stimulates

• branches located in each individual muscle cell