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Which type of muscle cell exhibits a longer refractory period?
Cardiac muscle cells exhibit a longer refractory period compared to skeletal muscle cells. This is important in preventing tetanic contractions and ensuring that the heart muscle can effectively pump blood.
Can cardiacmuscle be tetanize?
No, cardiac muscle cannot undergo tetanus. This is because the refractory period of cardiac muscle is longer than the duration of a contraction, preventing it from being tetanized. This is essential for proper heart function and the maintenance of a rhythmic heartbeat.
Can you provide an example of a refractory period in the context of human physiology?
In human physiology, a refractory period refers to a brief period of time after a nerve or muscle cell has been activated where it is temporarily unable to respond to another stimulus. An example of this is the refractory period in cardiac muscle cells, where after a heartbeat, there is a brief period where the muscle cell cannot contract again immediately. This helps regulate the heart's rhythm and prevent irregular heartbeats.
Why impossible for myocardium to go into tetany?
Muscle tetany occurs in muscles without absolute refractory period. The stimulus for contraction comes before the preceding contraction/relaxation is over leading to multiple action potentials without a refractory period. It does not occur in cardiac muscle because it has absolute refractory period during which the muscle cannot be excited, thus making tetany impossible
When a muscle is unable to respond to stimuli temporarily which period is it in?
The refractory period is when a muscle is temporary unable to respond to stimuli refractory period
Can the heart tetanize?
The cardiac muscle fiber absolute refractory is a long period of time (longer then skeletal muscles), so you cannot tetanize cardiac muscle fibers because it has to relax before it is able to contract again.
What period is a muscle is unable to respond to stimuli temporarily?
The period when a muscle is unable to respond to stimuli temporarily is called the refractory period. This period allows the muscle to reset and recover before it can receive and respond to additional stimuli.
What is the difference between the effective refractory period and the relative refractory period?
-The effective refractory period is the time in which the cell is incapable of responding to a second stimulus between the phases of 0-3.5, while the relative refractory period is the time in which the cell is making preparations to receive stimulus between phase 3.5-4.
What would happen if the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells?
tetanic contractions might occur, which would stop the hearts pumping action
Can skeletal muscle be tetanised?
Yes, because of the short refractory period of skeletal muscle (compared to cardiac muscle), skeletal muscle can be restimulated before the muscle is completely relaxed. If repeated enough times, the contractions fuse together i.e. they become tetanised.
Why do you keep the heart from entering tetanus?
The action potential of cardiac muscle is prolonged consisting of the depolarization spike and plateau and a repolarization period. The action potential causes a long refractory period of about 250-400 milliseconds in the heart.
What is relative refactory period?
The relative refractory period is the phase of the cardiac action potential during which a stronger-than-usual stimulus is required to elicit another action potential. It occurs immediately following the absolute refractory period and allows for the heart muscle to be able to respond to a second, stronger stimulus after the initial action potential.
