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.
The most important of those factors is, in fact, the pH level of your aquarium. To simplify it, there are two ways your aquariumâs pH balance can be thrown off, and many reasons why they can occur. Your aquariumâs pH can be ânormalâ, âlowâ, or âhighâ, and they each mean something different.