1. Muscle fibers develop tension by Question options: a. contraction of sarcomer
ID: 80597 • Letter: 1
Question
1. Muscle fibers develop tension by
Question options:
a. contraction of sarcomeres
b. shortening
c. the pushing of myosin by actin
d. all of the above
e. both a and b
2. Skeletal muscle tetanus
Question options:
a. is a staphylococcus infection of myofibrils
b. is caused by reduced calcium release by the sarcoplasmic reticula
c. is of shorter duration than skeletal muscle twitch
d. occurs when twitch contractions do not sum
e. is not described by any of the answers above.
3. Whole muscle tension depends on all of the following except
Question options:
a. number of muscle fibers contracting
b. tension produced by each contracting fiber
c. extent of motor-unit recruitment
d. frequency of stimulation
e. the proportion of each motor unit used at any given time
a. contraction of sarcomeres
b. shortening
c. the pushing of myosin by actin
d. all of the above
e. both a and b
2. Skeletal muscle tetanus
Question options:
a. is a staphylococcus infection of myofibrils
b. is caused by reduced calcium release by the sarcoplasmic reticula
c. is of shorter duration than skeletal muscle twitch
d. occurs when twitch contractions do not sum
e. is not described by any of the answers above.
3. Whole muscle tension depends on all of the following except
Question options:
a. number of muscle fibers contracting
b. tension produced by each contracting fiber
c. extent of motor-unit recruitment
d. frequency of stimulation
e. the proportion of each motor unit used at any given time
Explanation / Answer
1. (d) All of the above.
The neural control initiates the formation of actin–myosin bridges, leading to the sarcomere shortening involved in muscle contraction.
2. (d) occurs when twitch contractions do not sum
3. (e) extent of motor-unit recruitment
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