Heme Catabolism and Degradation Pathway - Biochemistry Lesson

The video explains heme catabolism, starting with the breakdown of red blood cells and hemoglobin. It details the role of the reticuloendothelial system in processing hemoglobin and the conversion of heme to biliverdin and then to bilirubin. The transport and conjugation of bilirubin in the liver are discussed, followed by its excretion through feces and urine. The video concludes with a summary of the process and some quick facts about red blood cells and bilirubin levels.

What is the primary component of red blood cells?

• Mitochondria

• Nucleus

• Cytoplasm

• Hemoglobin

Which system is responsible for engulfing red blood cell remnants?

• Digestive system

• Nervous system

• Reticuloendothelial system

• Endocrine system

What enzyme converts heme into biliverdin?

• Biliverdin synthase

• Bilirubin oxidase

• Heme oxygenase

• Heme reductase

What is the color of biliverdin?

• Red

• Blue

• Green

• Yellow

Which molecule is required for the conversion of biliverdin to bilirubin?

• NADPH

• ATP

• GTP

• FADH2

What protein does bilirubin bind to for transport in the blood?

• Myoglobin

• Fibrinogen

• Albumin

• Hemoglobin

What is the final product of bilirubin processing in the intestines?

• Urobilin

• Stercobilin

• Biliverdin

• Heme

What is the typical lifespan of a red blood cell?

• 60 days

• 120 days

• 150 days

• 90 days

Where are most red blood cells broken down?

• Kidneys

• Heart

• Liver

• Spleen

What is the normal range of total bilirubin in adult blood serum?

• 2.0 to 3.0 mg/dL

• 1.0 to 2.0 mg/dL

• 0.2 to 1.3 mg/dL

• 0.1 to 0.5 mg/dL