Muscle Questions - #2

Answers:
1) Skeletal muscle is described by all of the following EXCEPT:
d) autorhythmic

2) The walls of hollow organs and some blood vessels contain this muscle tissue:
d) smooth

3) Which of the following is unique to cardiac muscle tissue:

c) has intercalated discs

4) Approximately what percentage of body heat is generated by muscle tissue:
d) 85%

5) A muscle fascicle is a:
c) bundle of muscle fibers

6) The smallest contractile unit of skeletal muscle is a:
a) sarcomere

7) The major regulatory proteins in muscle tissue are:
d) troponin and tropomyosin

8) Which of the following actions is caused by skeletal muscle:
d) eye movements

9) Which of the following does NOT occur in a muscle during contraction:
b) muscle fibers stretch

10) This process aids in skeletal muscle relaxation after contraction:
c) acetylcholinesterease degrades acetylcholine

11) The stiffness of muscle tissue in rigor mortis partially results from:
b) excessive calcium release in muscle

12) A single motor neuron may innervate as few as 3-5 fibers in muscles of the:
c) eye

13) When an action potential reaches the presynaptic terminal of the motor neuron:
b) acetylcholine is released into the synaptic cleft

14) Lack of acetylcholinesterase in the synaptic cleft would result in:
c) excessive, continuous stimulation of the muscle fiber


15) Curare, a toxin, blocks the acetylcholine receptors on muscle tissue. This would result in:
b) inability of the muscle to respond to motor nerve stimulus

16) Training excersizes such as jogging, swimming and aerobics have this effect on skeletal muscle tissue:
a) increase number of mitochondria per muscle fiber

17) Muscular dystrophy is a congenital disorder characterized by
a) skeletal muscle degeneration

18) Which of the following disorders is characterized by painful musculoskeletal "tender points":
a) fibromyalgia

19) Anabolic steroids have all these effects except:
c) increases number of muscles in the body


20) Which of the following statements regarding aging and the muscular system is true:
a) aging is associated with decreased myoglobin production