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Muscular System Multiple Choice

Detailed not needed, just verifying choice

1. Which of the following does NOT compress the abdomen ______________. latissimus dorsi
rectus abdominis
external oblique
transversus abdominis
internal oblique

2. Paralysis of which of the following would make an individual unable to flex the thigh ______________.
iliopsoas and rectus femoris
vastus medialis
vastus intermedius
vastus lateralis
biceps femoris

3. Which of the following are composed of myosin ______________. thin filaments
all myofilaments
thick filaments
Z lines
light bands

4. Which of the following connective tissues surrounds an individual muscle cell ______________.

5. Which of the following groups of terms is placed in order from largest to smallest ______________.
fascicle, fiber, myofibril, myofilament
fiber, myofibril, myofilament, fascicle
myofilament, myofibril, fiber, fascicle
fascicle, fiber, myofilament, myofibril
fiber, myofibril, fascicle, myofilament

6. A muscle located on the dorsal side of the body is the ______________.
rectus femoris
pectoralis major
external intercostals
rectus abdominis

7. The mechanical force of contraction is generated by ______________.
a sliding of thin filaments past thick ones
the temporary disappearance of thin filaments
shortening of the thick filaments
shortening of the thin filaments
the "accordian-like" folding of thin and thick filaments

8. Muscle tone is ______________.
a state of sustained partial muscular contraction that is vital for the health of muscles
the ability of a muscle to maintain a contraction against an outside force
the feeling of well-being following exercise
the condition of atheletes after intensive training
the result of increased neuromuscular system coordination and increased metaboloc rate

9. During muscle contraction, myosin cross bridges attach to active sites of ______________.
Z lines
actin filaments
the H zone
myosin filaments
thick filaments

10. The broadest muscle of the back is the latissimus dorsi.

11. When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length. True

12. A prime mover of the arm that acts in adduction is the deltoid. True

13. Plantar flexion at the ankle joint is accomplished by the tibialis anterior muscle.

14. The effect of the neurotransmitter on the muscle cell membrane is to modify its permeability properties temporarily.

15. An aponeurosis is a ropelike piece of muscle fascia that forms indirect connections to muscles of the leg.

16. The sarcoplasmic reticulum is vital to the integrity of muscle contraction.

17. Oxygen debt refers to the oxygen required to make creatine phosphate.

Solution Preview

1. latissimus dorsi (because it is on the back, not the abdomen)

2. iliopsoas and rectus femoris (the other muscles listed would extend the knee or the thigh but the illiopsoas is definately involved in flexion of the thigh)

3. thick filament (actin is the contractile protein of the thin filament)

4. endomysium ("endo" means inside or innermost, and this is the innermost covering...the sarcolemma is not connective tissue)

5. fascicle, fiber, myofibril, myofilament (from largest to smallest...each of these is basically a bundle of the next one on the list)

6. trapezius ...

Solution Summary

Various multiple choice questions about muscles are explained.