1.- The microscopic unit of compact bone; also called osteon is:
a.- osteocyte; b.- osteoblast; c.- haversian system; d.- none of the above.
2.- The bone that forms the forehead is:
a.- frontal; b.- occipital; c.- mandible; d.- temporal.
3.- Name 3 functions of the skeletal system: ___________________________
4.- The type of freely movable joint at the elbow is:
a.- ball and socket; b.- hinge; c.- flexion; d.- pronation.
5.- The movement toward the midline of the body is:
a.- extension; b.- dorsiflexion; c.- adduction; d.- abduction.
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6.- The only type of muscle that is nonstriated is:
a.- skeletal muscle; b.- cardiac muscle; c.- smooth muscle; d.- all of them.
7.- The only type of muscle that is striated and voluntary is:
a.- cardiac muscle; b.- skeletal muscle; c.- smooth muscle; none of the above.
8.- Which muscle extends from the corners of the mouth to the cheekbone; called the smiling muscle ?
a.- buccinator; b.- orbicularis oris; c.- masseter; d.- zygomaticus.
9.- Which muscles produce movement of the extremities, maintain body posture, and stabilize joints?
a.- smooth muscle; b.- skeletal muscles; c.- striated and involuntary muscles; d.- all of the above.
10.- What is the role of the sarcoplasmic reticulum (SR) in muscle contraction?
a.- synthesizes actin; b.- releases calcium into the sarcomere; c.- releases acetylcholine; d.- none of the above.
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1. c.- haversian system
2. a.- frontal
3. – support to body – protection to internal organs – production of some important compounds.
4. a.- ball and socket
5. c.- adduction
6. c.- smooth muscle
7. b.- skeletal muscle
8. d.- zygomaticus
9. b.- skeletal muscles
10. c.- releases acetylcholine