If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells, _______
_. A) it would be much longer before cardiac cells could respond to a second stimulation B) contractions would last as long as the refractory period C) tetanic contractions might occur, which would stop the heart's pumping action D) pacemaker cells would cease to spontaneously depolarize
C. tetanic contractions might occur, which would stop the heart's pumping action.
Explanation:
The absolute refractory period of the cardiac muscle action potential refers to the time interval when the voltage gated sodium channels are inactivated. The absolute refractory period lasts ~180 msec. The action potential lasts 200-220 msec.
The refractory period of cardiac muscle is dramatically longer than that of skeletal muscle. This prevents tetanus from occurring and ensures that each contraction is followed by enough time to allow the heart chamber to refill with blood before the next contraction.
In order words, It is important for the cardiac muscle cells to have a longer refractory period, because if they were short like the skeletal muscles, the heart could enter tetanic contraction/summation which is when muscle is stimulated so rapidly that it does not have a chance to relax at all between stimuli.
The soybean and the fungus might die because both of them are depending their lives on the said crop and both of them are having competition in having the nutrients for their survival.
The soy beans might be damage and the products of the farmer will decrease.
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You inherited your eye color and genes from your parents. You can easily change how fast you drive, your accent and your food preferences no matter who you're related to.
Large intestine is the last part of the alimentary canal (digestive tract) and it is the place where water is absorbed and remaining waste material stored and ready to be pull out. The large intestine can be divided into f five sections:
• the cecum (with appendix) plus the ascending colon which connects it with the next part,
