RBC Metabolic Pathways Quiz
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Questions and Answers

What is the primary function of the Catulase enzyme?

  • Convert H2O2 to H2O and O2 (correct)
  • Convert free radicals to hydrogen peroxide
  • Convert O2 to H2O2
  • Convert O2 to free radicals
  • What is the main reason behind the enlargement of the abdomen in individuals with thalassemia?

  • Liver inflammation
  • Gastrointestinal bleeding
  • Enlarged or swollen spleen (correct)
  • Kidney dysfunction
  • What is the fate of bilirubin once it is conjugated in the liver?

  • It becomes part of the bile in the gallbladder
  • It is excreted as urobilinogen in the small intestine (correct)
  • It is converted to biliverdin in the large intestine
  • It gets reabsorbed in the kidney tubules
  • What happens to RBC flexibility after 100-140 days?

    <p>It decreases, leading to difficulty passing through capillaries</p> Signup and view all the answers

    What is the primary role of glutathione in its reduced form?

    <p>To convert NADP to NADPH by donating a hydrogen ion</p> Signup and view all the answers

    In which reaction of the Hexose monophosphate shunt pathway does the enzyme glucose-6-phosphate dehydrogenase play a crucial role?

    <p>Conversion of glucose-6-phosphate to 6-phosphogluconate</p> Signup and view all the answers

    What is the primary function of the Hexose monophosphate shunt pathway?

    <p>Generation of NADPH</p> Signup and view all the answers

    What is the significance of NADPH generated in the Hexose monophosphate shunt pathway?

    <p>It supports antioxidant defenses</p> Signup and view all the answers

    What is the main consequence of oxidative stress on the body?

    <p>Increased free radical formation</p> Signup and view all the answers

    Which enzyme is involved in the first reaction of the Hexose monophosphate shunt pathway?

    <p>Glucose-6-phosphate dehydrogenase</p> Signup and view all the answers

    Study Notes

    Catulase Enzyme Function

    • Catulase acts as a catalyzer to convert hydrogen peroxide into water and oxygen, protecting cells from oxidative damage.

    Thalassemia and Abdominal Enlargement

    • Individuals with thalassemia experience abdominal enlargement mainly due to splenomegaly, as the spleen works harder to filter abnormal red blood cells.

    Fate of Bilirubin After Conjugation

    • Once conjugated in the liver, bilirubin is transformed into a water-soluble form that can be excreted in bile or urine, thereby aiding in the elimination of waste.

    RBC Flexibility After 100-140 Days

    • After 100-140 days, red blood cells (RBCs) lose their flexibility, contributing to their recognition and destruction by the spleen.

    Role of Glutathione

    • In its reduced form, glutathione serves as a crucial antioxidant, protecting cells from oxidative stress by neutralizing reactive oxygen species.

    Glucose-6-Phosphate Dehydrogenase in Hexose Monophosphate Shunt

    • Glucose-6-phosphate dehydrogenase catalyzes the first step of the hexose monophosphate shunt pathway, which is critical for generating NADPH.

    Primary Function of Hexose Monophosphate Shunt Pathway

    • The hexose monophosphate shunt pathway is primarily responsible for producing NADPH and ribose-5-phosphate, vital for nucleotide synthesis and reducing agents.

    Significance of NADPH in Hexose Monophosphate Shunt

    • NADPH generated in the hexose monophosphate shunt is essential for biosynthetic reactions, including fatty acid synthesis and maintaining glutathione in its reduced form.

    Consequence of Oxidative Stress

    • Oxidative stress can lead to cellular damage, inflammation, and diseases such as cancer, cardiovascular disorders, and neurodegeneration.

    First Reaction Enzyme of the Hexose Monophosphate Shunt

    • The enzyme involved in the first reaction of the hexose monophosphate shunt pathway is glucose-6-phosphate dehydrogenase, initiating the pathway's crucial processes.

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    Description

    Test your knowledge about the metabolic pathways in red blood cells, including glycolytic pathways, Luebering-Rapoport pathway, pentose phosphate pathway, and hexose monophosphate shunt. Explore the important metabolic processes and pathways involved in the fate of red blood cells.

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