1. A sarcomere is best described as:
A. a portion of the sarcoplasmic reticulum
B. the cytoplasm of a muscle fiber
C. a group of myofibrils
D. a unit within a myofibril
2. Myofibrils are composed primarily of:
A. actin
B. myosin
C. all of the above
3. Acetylcholine is stored in vesicles within:
A. myofibrils
B. motor units
C. motor neuron endings
D. motor end plates
4. Creatine phosphate serves to:
A. cause the decomposition of ATP
B. cause the decomposition of ADP
C. supply a phosphate for the conversion of ADP to ATP
D. supply a phosphate for the conversion of ATP to ADP
5. Cholinesterase
A. causes calcium to go into muscle
B. breaks down acetylcholine
C. causes muscle contraction
D. all of the above
6. A motor unit includes:
A. muscle fibers only
B. motor neurons only
C. several motor neurons and one muscle fiber
D. several muscle fibers and one motor neuron
7. The muscle responsible for most of a body movement is termed the:
A. antagonist
B. prime mover
C. synergist
D. aponeurosis
8. Endomysium surrounds individual muscle cells.
A. true
B. false
9. A place in the body where you find multi-unit smooth muscle is
A. the eye
B. walls of blood vessels
C. the wall of the stomach
D. both A and B
10. What is the role of calcium in muscle contraction?
A. it is needed to allow myosin to bind to actin
B. it is needed to allow myosin to "let go" of actin
C. it is needed to break down acetylcholine
D. calcium plays no role in muscle contraction
11. Which muscle acts to raise the eyebrows?
A. orbicularis oris
B. frontalis
C. temporalis
D. sternocleidomastoid
12. Which muscle is located in the upper part of the arm?
A. biceps brachii
B. anterior tibialis
C. gluteus maximus
C. biceps femoris
Answers:
1. d 2. c 3. c 4. c 5. a 6. d 7. b 8. a 9. d 10. a 11. b 12. a