Exam (elaborations)
KIN 270 Exam 3 With Complete Solutions Latest Update
- Course
- KIN 270
- Institution
- University Of Illinois - Urbana-Champaign
KIN 270 Exam 3 With Complete Solutions Latest Update
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KIN 270 Exam 3 With CompleteSolutions Latest Update
what determines whether or not a muscle fiber is either contracted or relaxed?
ANS✔✔ -frequency of stimulation
-# of cross bridges pivoting --> molecular basis, the more contraction
-fibers resting length at time of stimulation --> close as can get, cant move
(limiting factor)
what is the length-tension relationship? ANS✔✔ optimum overlap produces
the greatest amount of tension (too much/little decreases deficiency)
(overlap=myosin and actin)
what are the phases of tension production by MF? ANS✔✔ latent,
contraction, relaxation
latent ANS✔✔ action potential moves through sarcomere releasing ca++
contraction ANS✔✔ Ca++ binds tension builds to peak
relaxation ANS✔✔ Ca++ reuptake, myosin heads detach
what is treppe ANS✔✔ -a stair step decrease in twitch tension
-stimulus immediately after the end of relaxation
-causes an increase in tension by causing series of contractions
, what is wave summation ANS✔✔ -increasing tension/summation of
twitches
-repeated stimulus before the end of relaxation phase
-causes increasing tension
define incomplete tetanus ANS✔✔ twitches reach individual max tension,
rapid stimulation occurs and muscle is not allowed to relax
what is complete tetanus? ANS✔✔ stimulation frequency is high enough,
muscle never begins to relax and in continuous contraction
what is a motor unit? ANS✔✔ motor neuron and muscle fibers
process of recruitment aka multiple motor unit summation ANS✔✔ smooth
motion and increasing tension are produced by slowly increasing the size of #
of motor units stimulated.
when is maximum tension achieved? ANS✔✔ when all motor units reach
tetanus, sustained for short time
what is muscle tone ANS✔✔ the normal tension and firmness of a muscle at
rest
what is an isotonic contraction ANS✔✔ skeletal muslce changes length
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