HBIO 320 - MUSCLE PHYSIOLOGY | MIDTERM 2 EXAM
QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS GRADED A++
A contraction that creates force without moving a load is an ________
contraction.
Isometric
The ______ ____ stretch and absorb the force produced by contracting
sarcomeres.
Elastic Elements
TIme to Peak Tension, Relaxation Times (50 and 90%) are all determined by the
duration of the _______ transient.
Calcium
Rate of Tensin development is ________ of the calcium transient.
Independent
Time lag from ____ release at the NMJ to ______ _____ is limited by diffusion
across synapse.
ACh, Muscle Depolarization
A single neural stimulation produces a single contraction or _______.
Twitch (7-100 ms)
, What are the three phases of a twitch?
Latent Period, Contraction Phase, Relaxation Phase
How long is the latent period?
~1-2ms
How long is the contraction phase?
2s - 10s of msec
How long is the relaxation phase?
(~25 msec)
This period is the delay before Calcium release as action potential moves through
sarcolemma.
Latent Period
This period has calcium ions binding to troponin and tension builds to peak.
Contraction Phase
This period has the SERCA causing the sarcoplasmic calcium levels to fall, active
sties are covered; tension decreases
Relaxation Phase
Sustained muscular contractions require ______ stimuli.
Repeated
A single ____ will not produce normal movement. (requires many cumulative
twitches).
Twitch
Stimuli arrive at a frequency that prevents complete relaxation (SERCA cannot
reabsorption all Ca2+) so that tension builds upon the previous twitch
QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS GRADED A++
A contraction that creates force without moving a load is an ________
contraction.
Isometric
The ______ ____ stretch and absorb the force produced by contracting
sarcomeres.
Elastic Elements
TIme to Peak Tension, Relaxation Times (50 and 90%) are all determined by the
duration of the _______ transient.
Calcium
Rate of Tensin development is ________ of the calcium transient.
Independent
Time lag from ____ release at the NMJ to ______ _____ is limited by diffusion
across synapse.
ACh, Muscle Depolarization
A single neural stimulation produces a single contraction or _______.
Twitch (7-100 ms)
, What are the three phases of a twitch?
Latent Period, Contraction Phase, Relaxation Phase
How long is the latent period?
~1-2ms
How long is the contraction phase?
2s - 10s of msec
How long is the relaxation phase?
(~25 msec)
This period is the delay before Calcium release as action potential moves through
sarcolemma.
Latent Period
This period has calcium ions binding to troponin and tension builds to peak.
Contraction Phase
This period has the SERCA causing the sarcoplasmic calcium levels to fall, active
sties are covered; tension decreases
Relaxation Phase
Sustained muscular contractions require ______ stimuli.
Repeated
A single ____ will not produce normal movement. (requires many cumulative
twitches).
Twitch
Stimuli arrive at a frequency that prevents complete relaxation (SERCA cannot
reabsorption all Ca2+) so that tension builds upon the previous twitch
