Really need some help with this question! If you have links that would be even b
ID: 272906 • Letter: R
Question
Really need some help with this question! If you have links that would be even better!
When Sherrington measured the reaction time of a reflex (i.e., the delay between stimuli and response), he found that the response occurred faster after a strong stimuli than the weak one. Can you explain this finding? Remember that all action potential- whether produced by a strong or weak stimuli- travel at the same speed along a given axon.
Reflection Question: If a drug partly blocks a membrane’s potassium channels, how does it affect the action potential?
Explanation / Answer
A strong stimulus my cause thousands of neurons to fire at the same time and at hundreds of times per second so the responce will be faster, The strength of signal may increase the number of neurons to react at once so that the passing through threshold potential to generate action potential is faster, hence the quick responce is possible. Where as th week stimulus may cause less number of neurons to fire so it may lag to show the responce. The action potentials firing causes the cell to depolarise by the action rapid opening of fast sodium channels and slow calcium channels. Once these channels got deactivated than potatium channels opens and repolarises the cell back to normal. If any drug blocks the membrane potatium channels than it delay the repolarisation of the cells, increase in action potential duration and an increase in the effective refractory period (ERP). Potatium blockers are cardio protective drugs.
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