Transcript of Heart Disease and the Excretory System. Heart Disease and the excretory Heart disease slows the oxygen flowing throughout the body. So oxygen moves slower to the excretory system.
The most likely causes of a shift in pH are: 1  Something in the water source buffering the water. 2  Something in the tank buffering the water. 3  or Something you are adding to the tank.
Carbon Dioxide. Given enough light and carbon dioxide, plants absorb carbon dioxide and produce oxygen. Carbon dioxide will lower the pH of aquarium water, making it more acidic, while oxygen has no effect on water pH. Therefore, when plants absorb carbon dioxide, thus removing it from the water, the pH will rise. Typically, this has a small, but measurable effect on pH.