Ornithine cycle (urea cycle)

Urea is produced in the liver cells by the

• Calvin cycle

• Citrulline cycle

• Ornithine cycle

• Krebs cycle

The process of formation of ammonia in the liver from excess of amino acids is called

• Detoxification

• Deamination

• Translation

• Egestion

Nitrogenous waste which is less toxic, soluble in water and is formed during ornithine cycle is

• Urea

• Uric acid

• Ammonia

• Amino acid

Excretory product of fresh water fishes is

• Urea

• Uric acid

• Ammonia

• Guanine

How is ammonia detoxified by the liver?

• using ethanol dehydrogenase
• converted into hydrophobic substances
• converted into hydrophilic substances
• converted into urea

Why does ammonia have to be converted to urea before being carried in the blood?

• Ammonia is highly soluble and toxic

• Ammonia is highly insoluble and non-toxic

Where does A lead to?

• Hepatic portal vein

• Hepatic vein

• Hepatic artery

• Aorta

What is B?

• bile duct

• bile calaliculi

• hepatic artery

• sinusoid

What is C?

• hepatic vein

• sinusoid

• hepatic portal vein

• bile canaliculi

What type of cell is a Kupffer cell?

• platelet

• leucocyte

• hepatocyte

• macrophage