Excretion in Mammals (Liver) 5.0 / 5 based on 1 ratingTeacher recommended ? BiologyHuman, animal and plant physiologyA2/A-levelOCR Created by: gemmmmmaCreated on: 05-03-18 19:41 What is urea? It is formed by the breakdown of amino acids by the liver. 1 of 12 How is oxygenated blood delivered to the liver? Hepatic artery 2 of 12 How is oxygenated blood removed from the liver/ returned to the heart? Hepatic vein 3 of 12 What does the hepatic portal vein do? Carries blood with products from digestion to the liver. 4 of 12 What are liver cells called? Hepatocytes 5 of 12 Why does blood from the hepatic artery and hepatic portal vein mix in the sinusoids? To increase the oxygen content of the blood from the hepatic portal vein, providing hepatocytes with plenty of oxygen. 6 of 12 What do Kupffer cells in the sinusoids do? Act as macrophages to ingest foreign particles and prevent disease. 7 of 12 What do hepatocytes do? They secret bile from the breakdown of blood into canaliculi, which drains into bile ductules into the gall bladder. 8 of 12 Briefly, what is carbohydrate metabolism? Hepatocytes convert glucose to glycogen, which is stored in the liver and restored to glucose when needed. 9 of 12 Briefly, what is deamination of excess amino acids? The removal of an amine group from a molecule, preventing the excretion of useful excess proteins. 10 of 12 Deamination of amino acids converts ______ into urea. Ammonia 11 of 12 How do hepatocytes break down hydrogen peroxide? Hepatocytes contain the enzyme catalase, splitting hydrogen peroxide into O2 and H2O 12 of 12
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