Dense Tubular System and Granulomere Quiz
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Questions and Answers

What is the life span of a platelet?

  • 15 days
  • 20 days
  • 10 days (correct)
  • 5 days
  • Which cell gives rise to platelets through fragmentation of cytoplasm?

  • T lymphocyte
  • Megakaryoblast (correct)
  • Basophil
  • Neutrophil
  • What is the unique feature of a megakaryocyte's nucleus during maturation?

  • Visible nucleoli
  • Polyploidy (correct)
  • Small size
  • Smooth chromatin
  • What organelle is abundant in the cytoplasm of a megakaryocyte?

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

    Which event leads to the formation of demarcation membranes within a megakaryocyte?

    <p>Plasma membrane invaginations</p> Signup and view all the answers

    What is the approximate range of platelet count per mm3 of blood in adults?

    <p>~200,000 - 350,000</p> Signup and view all the answers

    What is the main function of the dense tubular system in platelets?

    <p>Ca sequestration during resting states and release upon activation</p> Signup and view all the answers

    Which type of granule in platelets contains growth factors and adhesive proteins?

    <p>Alpha granules (a-granules)</p> Signup and view all the answers

    What is the main function of Delta granules (δ-granules) in platelets?

    <p>Contain hemostatically active molecules for vasoconstriction</p> Signup and view all the answers

    Which organelle in platelets is responsible for clot resorption?

    <p>Lambda granules (λ-granules)</p> Signup and view all the answers

    What is the role of platelets in haemostatic process after injury to the vessel wall?

    <p>Deaccelerating by tethering to the site of injury</p> Signup and view all the answers

    Which structure in platelets is involved in the generation of ATP for platelet activation?

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

    Which of the following is NOT a component of the platelet cytosol?

    <p>Rough endoplasmic reticulum</p> Signup and view all the answers

    What is the primary function of the microtubules in the platelet cytoskeleton?

    <p>Maintain the discoid morphology of platelets</p> Signup and view all the answers

    Which of the following statements about the open canalicular system (OCS) in platelets is correct?

    <p>It facilitates the entry of external elements into platelets and the release of granule contents</p> Signup and view all the answers

    What is the primary function of the glycoprotein molecules (GPs) present in the platelet plasmalemma?

    <p>Interact with vessel wall components and molecules involved in platelet adhesion</p> Signup and view all the answers

    Which of the following statements about the demarcation membranes in thrombopoiesis is correct?

    <p>They outline areas of the cytoplasm that will be fragmented, forming the platelets</p> Signup and view all the answers

    What is the primary function of the actin and myosin filaments in the platelet cytoskeleton?

    <p>Participate in platelet movements and retraction during hemostasis</p> Signup and view all the answers

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