Experiment 2: Summation of contractions

You may recall the approximate time frame of the refractory periods from lectures or other learning activities. If not ask a friend or google it now.

Do these seem similar to any of the ISI’s used in Experiment 2?
It is very likely that at the lowest ISI (2 ms), the axons are still in their absolute refractory period.

What will this mean in terms of the skeletal muscle fibres?

Question

Experiment 2: Summation of contractions

You may recall the approximate time frame of the refractory periods from lectures or other learning activities. If not ask a friend or google it now. 
     
         Do these seem similar to any of the ISI’s used in Experiment 2? 
         It is very likely that at the lowest ISI (2 ms), the axons are still in their absolute refractory period.

What will this mean in terms of the skeletal muscle fibres?

Accepted Answer

There is only one twitch. The second stimulus will not reach the muscle fibre as the nerve is refractory.

Answer

There is only one twitch. The sarcolemma will be refractory, so a second contraction can not be initiated.

Answer

There are two twitches, but no summation. The second stimulus makes a twitch the same amplitude as the first, like at the largest ISI.

Crowdly

Experiment 2: Summation of contractions You may recall the appr...

Experiment 2: Summation of contractions

Want instant access to all verified answers on moodle.telt.unsw.edu.au?