Enterocyte Amino Acid Absorption and Kwashiorkor Disease
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Questions and Answers

What is the main component that makes each amino acid unique?

  • Acid (carboxylic acid)
  • Side group (correct)
  • Amino group (nitrogen)
  • Carbon skeleton
  • When dietary amino acids are absorbed, what is one of their fates besides liver synthesis?

  • Converted to vitamins
  • Stored in adipose tissue
  • Oxidized for energy (correct)
  • Excrete through urine
  • How does the utilization of amino acids differ from carbohydrates and fats?

  • Amino acids are stored in muscle tissue
  • Amino acids are stored in the liver
  • Amino acids are stored as glycogen
  • Amino acids are not stored like carbohydrates and fats (correct)
  • What is the physiological significance of the free amino acid pool in the body?

    <p>To maintain the ratio of amino acids for protein synthesis</p> Signup and view all the answers

    How many essential amino acids are there, and which pair is considered conditionally essential?

    <p>9 essential; phenylalanine to tyrosine</p> Signup and view all the answers

    How many amino acids are classified as non-essential?

    <p>10</p> Signup and view all the answers

    Where does the process of transamination occur?

    <p>In the liver</p> Signup and view all the answers

    What is the general reaction for producing a new amino acid from an amino acid and a keto acid?

    <p>Amino acid + keto acid = new amino acid</p> Signup and view all the answers

    What is the primary structure of a protein defined as?

    <p>The literal sequence of amino acids</p> Signup and view all the answers

    In which part of the digestive system does the chemical digestion of amino acids start?

    <p>Stomach</p> Signup and view all the answers

    How are dietary proteins primarily absorbed in the small intestine?

    <p>As amino acids and dipeptides</p> Signup and view all the answers

    Where do pancreatic proteases cleave dietary proteins into amino acids and oligopeptides?

    <p>Small intestine</p> Signup and view all the answers

    What enzyme is responsible for facilitating the removal of ammonia groups from amino acids?

    <p>Glutamate dehydrogenase</p> Signup and view all the answers

    What is the main purpose of the urea cycle?

    <p>To maintain nitrogen balance</p> Signup and view all the answers

    Which condition can lead to elevated ammonia levels and subsequently hepatic encephalopathy?

    <p>Liver disease</p> Signup and view all the answers

    What clinical measurement is commonly used to assess urea levels in the blood?

    <p>Blood urea nitrogen (BUN)</p> Signup and view all the answers

    In which organ does glutamine act as an ammonia scavenger?

    <p>Kidney</p> Signup and view all the answers

    What condition is associated with negative nitrogen balance?

    <p>Sepsis</p> Signup and view all the answers

    Which process describes the conversion of glucose to pyruvate in the muscle?

    <p>Glycolysis</p> Signup and view all the answers

    Which amino acid acts as a major gluconeogenic amino acid?

    <p><strong>Alanine</strong></p> Signup and view all the answers

    Where are branched-chain amino acids primarily catabolized?

    <p>Peripheral tissue (skeletal muscle)</p> Signup and view all the answers

    Why are branched-chain amino acids oxidized primarily outside the liver?

    <p>Peripheral tissues have higher energy requirements</p> Signup and view all the answers

    What is the main cause of kwashiorkor disease?

    <p>Protein deficiency with normal caloric intake</p> Signup and view all the answers

    What are the primary symptoms of kwashiorkor?

    <p>Edema, muscle wasting, immune dysfunction, and poor growth</p> Signup and view all the answers

    Which of the following is NOT associated with kwashiorkor?

    <p>Hyperalbuminemia</p> Signup and view all the answers

    How is the amino acid pool in the human body maintained?

    <p>Proteolysis</p> Signup and view all the answers

    What is the fate of nitrogen after the degradation of amino acids?

    <p>Excreted as urea</p> Signup and view all the answers

    Which enzyme facilitates the transamination of alanine?

    <p>Aminotransferases</p> Signup and view all the answers

    What does elevated AST and ALT indicate in a liver function test?

    <p>Liver disease or damage</p> Signup and view all the answers

    What are the primary treatments for kwashiorkor?

    <p>Nutritional rehabilitation and therapeutic feeding programs</p> Signup and view all the answers

    What is the main function of amino acids in the gut?

    <p>Serving as a source of energy</p> Signup and view all the answers

    Where is the majority of the free amino acid pool located in the body?

    <p>Circulating in the blood</p> Signup and view all the answers

    What is the physiological significance of glutamine in the kidney, besides fuel?

    <p>Buffering excess ammonia</p> Signup and view all the answers

    During fasting, what is the major site contributing to the amino acid pool?

    <p>Muscles</p> Signup and view all the answers

    What can a pure protein meal promote in terms of hormone secretion?

    <p>Little insulin and glucagon release</p> Signup and view all the answers

    Where is glutamine primarily used as a source of energy?

    <p>Gut (enterocytes)</p> Signup and view all the answers

    What can a hypercatabolic state be caused by?

    <p>Surgery, trauma, burns, and septic stress</p> Signup and view all the answers

    What percentage of ATP does the catabolism of branched chain amino acids (BCAAs) produce?

    <p>~20-25%</p> Signup and view all the answers

    "Besides serving as fuel, what can oxidation of BCAAs produce in muscles?"

    <p>Glutamine and alanine</p> Signup and view all the answers

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