Chap 3 - Skin & Blood.txt

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Chap 3 - Skin & Blood.txt
2011-09-16 07:38:07

Skin & Blood
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  1. What are the layers of the Skin?
    • Epidermis
    • Dermis
    • Subcutaneous tissue
  2. What is the Epidermis?
    Outermost layer of the skin comprised of dead or dying cells
  3. What is the Sebum?
    Fatty secretion of the sebaceous gland that helps keep skin pliable & waterproof
  4. What is the Dermis?
    True skin (aka. corium); layer of tissue producing the epidermis & housing the structures , blood vessels & nerves
  5. What are the Sebaceous Glands?
    Glands w/in the dermis secreting sebum
  6. What are the Sudoriferous Glands?
    Glands w/in the dermis that secrete sweat
  7. What is Subcutaneous Tissue?
    Body layer beneath the dermis
  8. What is the Hematopoietic System?
    Production & development of blood cells; consists of bone marrow, liver, spleen, kidneys, & blood
  9. What is a Pluripotent Stem Cell?
    Cell from which the various types of blood cells can form
  10. What is Hematopoiesis?
    Process thru which pluripotent stem cells differentiate into various types of blood cells
  11. What is Erythropoietin?
    Hormone responsible for RBC production
  12. What are the components of Blood?
    • Plasma
    • Formed elements
    • RBC
    • WBC
    • Platelets
  13. What is Plasma?
    Thick, pale yellow fluid that makes up the liquid part of the blood
  14. What is an Erythrocyte?
    Red Blood Cell (RBC)
  15. What is Hemoglobin?
    O2-bearing molecule in RBCs; made up of iron-rich red pigment called heme & protein called globin
  16. What is PO2?
    Partial pressure of O2; pressure exerted by a given component of a gas containing several components
  17. What is PCO2?
    Partial pressure of carbon dioxide
  18. What is Bohr Effect?
    Phenomenon in which a decrease in PCO2 causes an increase in the quantity of O2 that binds w/ the hemoglobin
  19. What is 2,3-diphosphoglycerate?
    Chemical in RBCs that affect hemoglobin's affinity for O2
  20. What is Erythropoiesis?
    Process of producing RBCs
  21. What is hemolysis?
    Destruction of RBCs
  22. What is Sequestration?
    Trapping of RBCs by an organ
  23. What is Hemocrit?
    The packed cell volume of RBCs per unit of blood
  24. What is a Leukocyte?
    White Blood Cell (WBC)
  25. What is Chemotaxis?
    Movement of WBCs in response to chemical signals
  26. What is Phagocytosis?
    Process in which WBCs engulf & destroy an invader
  27. What is Leukopoiesis?
    Process thru which stem cells differentiate into the WBCs immature forms
  28. What are the '3' types of WBC Blasts?
    • Myeloblasts
    • Monoblasts
    • Lymphoblasts
  29. What is an Autoimmune Disease?
    Condition in which the body makes antibodies against its own tissues
  30. What is an Inflammatory Process?
    Nonspecific defense mechanism that wards off damage from microorganisms or trauma
  31. What is a Thrombocyte?
    Blood platelet
  32. What is Hemostasis?
    Combined mechanisms that work to prevent or control blood loss
  33. What is Fibrinolysis?
    Process thru which plasmin dismantles a blood clot
  34. What is Thrombosis?
    Clot formation