HBIO 320 - Muscle Physiology | Midterm 2
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 ✔✔Complete or Unfused Tetanus
