Answer: A (i think) Hope that helps!
Explanation:
The Sa node sends out an electrical impulse. The upper heart chambers (atria) contract.
Not sure if this is for nutrition but water is needed for the body to digest to get the nutrients in meals such has apples or oranges water helps the stomach digest it for you can get all the nutrients
I don't know if I will be able to answer your question correctly, but I think your sticking to a decision to not use tobacco when you get rid of all tobacco items and or tobacco it self and to do everything you can to not even be close to it.
Sorry if this is not what you are looking for
They are while and a brownish color
