Answer:
The correct answer is - relative refractory period.
Explanation:
The relative refractory period is a period that stimulates a secondary response if the stimuli are greater than the normal. It occurs when partial repolarization after a nerve fiber fired.
The relative refractory period is one of the two types of the refractory period which is the relative and absolute refractory period. In the absolute refractory period, it is not possible to activate another action potential in membrane.
Thus, the correct answer is - relative refractory period.
<u>Answer:</u>
Mitochondria, the organelles involved in cellular respiration, can also generate chemicals called reactive oxygen species (ROSs). ROSs can damage mitochondria. Damaged mitochondria generate more ROSs than healthy mitochondria. This is an example of a positive feedback mechanism
The reactive oxygen species that are given out by the mitochondria during cellular respiration are the major cause of aging. Though this has a lot of negative effects but this also has a small amount of positive effects such as the start of angiogenesis or cell proliferation.
20% sames more like the answer than the other three. But I'm considering that it could be 50%, but, it doesn't convince me. So, I'd say: C. 20%
It's phase contrast microscopy
Because you need to contrast to see the specimen
