The number of H+ ions moving down the channel.
So id say the answer is C.
<span>The pressure generated during contraction of the atria is less than that generated during contraction of the ventricles.The reason is the different distance from the artria to ventricles and the distance from ventricles to circulatory system.
</span>The distance from atria<span> to </span>ventricles<span> is </span>less than<span> that from </span>ventricles<span> to circulatory system.</span>
Scientific notation is important because astronomers and other scientist use this when they are working with very large or very small numbers. You already know that scientific notation is a system for writing and working with numbers that makes it much easier to deal with numbers that are very small or very large.
1. Scientific Notation expresses a value as the product of a number between 1 and 10 and a power of ten.
2. D
3. it makes very large or very small numbers easier to work with.
4. B and D
5. False
Hope these are correct :) Have a great day