In the reaction of methane, the reactants have how many total atoms
2
3
9

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Vessels draining the myocardium of the heart, open primarily ,into which chamber?

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient