Question

i. directions: read each statement carefully. if the statement is true, place a plus (+) in the space provided. if the statement is false, cross out the italicized word(s) and write the correct word(s) in the space provided.

1. smooth muscles are attached to bone and are under voluntary control.
2. muscle strain is the inflammation of a tendon, which commonly occurs in the shoulder or elbow.
3. skeletal muscles line passageways and are involuntary.
4. a muscle that opens a joint is an extensor.
5. cardiac muscle forms the walls of the heart.

ii. directions: in the space provided, write the letter of the choice that best completes the statement or answers the question.

1. muscle fibers contract and relax in response to

a. nerve impulses.
b. voluntary control.
c. flexors and extensors.
d. muscle tone.

1. which of the following is an inherited disorder of the muscular system?

a. tendonitis
b. muscular dystrophy
c. muscle strain
d. hernia

1. muscle strains can be treated by

a. braces.
b. casts.
c. ice and rest.
d. arthroscopic surgery.

1. aerobic exercise is especially important for

a. cardiac muscle.
b. smooth muscle.
c. skeletal muscle.
d. all of the above

1. which muscle types appear striated when viewed under a microscope?

a. cardiac and smooth
b. skeletal and smooth
c. skeletal and cardiac
d. skeletal, smooth, and cardiac

Explanation:

1. Smooth muscles are involuntary and line internal organs, not attached to bone and under voluntary control. Skeletal muscles are attached to bone and voluntary.
2. Muscle strain is over - stretching or tearing of muscle or tendon, not tendon inflammation (tendonitis).
3. Smooth muscles line passageways and are involuntary; skeletal muscles are attached to bone and voluntary.
4. An extensor muscle opens a joint.
5. Cardiac muscle forms the heart walls.
6. Muscle fibers contract and relax in response to nerve impulses.
7. Muscular dystrophy is an inherited disorder of the muscular system. Tendonitis is tendon inflammation, muscle strain is over - stretching, and hernia is a protrusion.
8. Muscle strains are treated with ice and rest to reduce swelling and allow healing.
9. Aerobic exercise is important for all muscle types as it improves cardiovascular health which benefits all muscles.
10. Skeletal and cardiac muscles appear striated under a microscope; smooth muscles are non - striated.

Answer:

1. False. Skeletal muscles are attached to bone and are under voluntary control.
2. False. Tendonitis is the inflammation of a tendon.
3. False. Smooth muscles line passageways and are involuntary.
4. True.
5. True.
6. a. nerve impulses.
7. b. muscular dystrophy.
8. c. ice and rest.
9. d. all of the above.
10. c. skeletal and cardiac.