How do the kidneys work to maintain normal pH of the blood? Explain the relation

How do the kidneys work to maintain normal pH of the blood? Explain the relationship between the kidneys, lungs, and blood pH homeostasis.
Trace a molecule of food as it moves through the digestive system and is absorbed into the blood stream. Describe what happens at each stage of the digestive process.
The liver is known for its ability to remove certain toxins from the blood. It can perform this function because its cells, or hepatocytes, contain large quantities of lysosomes and peroxisomes, and also have an extensive smooth endoplasmic reticulum. Briefly describe how these three organelles contribute to this major function of the liver.
Jaundice is caused by the accumulation of bilirubin in her blood and tissues. What is the normal fate of bilirubin, and what role does the liver play? How is cirrhosis related to jaundice?