Immune system & lymphatic organ MCQ 13+

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• Lymphatic system is found in
  ক

  Mucosa of digestive system

  খ

  Liver

  গ

  Central nervous system

  ঘ

  Cartilage

  ঙ

  Epidermis of skin
• The lymphatic capillaries
  ক

  Originate as blind ended vessels

  খ

  Are absent in nervous system

  গ

  Have fenestrations in their endothelial cells

  ঘ

  Have tight junctions between the endothelial cell

  ঙ

  Have almost no basal lamina
• In the immune system of the body
  ক

  The neutrophils are phagocytic cells.

  খ

  The antigen presenting cells include the langerhans' cells of skin.

  গ

  Germinal centres are absent from the spleen.

  ঘ

  Germinal centres produce B hymphocytes.

  ঙ

  The T cells mature both in the central and peripheral lymphoid tissues.
• Brown fat is
  ক

  Richer in mitochondria than ordinary fat

  খ

  More vascular than ordinary fat

  গ

  Important in neonatal thermoregulation

  ঘ

  More abundant in adults

  ঙ

  Stimulated by parasympathetic activity to generate heat
• In lymphoid organs
  ক

  The Periarteriolar lymphatic sheaths of the spleen are composed mainly of reticular fibers

  খ

  Plasma cells are found in the subcapsular sinus of lymph node

  গ

  Hassall’s corpuscles are found in the cortex of the thymus

  ঘ

  Tonsils are characterized by the crypts of Lieberkuhn

  ঙ

  The trabeculae of spleen mainly composed of collagen and elastic fibres
• In the spleen
  ক

  There are numerous macrophages

  খ

  The red pulp is contained within the sinusoids

  গ

  The lymphocytes are aggregated to form splenic follicles around arterioles

  ঘ

  Newly formed lymphocytes enter into blood vessels directly

  ঙ

  The capsule contains a considerable amount of smooth muscle
• Cells present in intestinal mucosa include
  ক

  Absorptive cell

  খ

  M cell

  গ

  PANETH cell

  ঘ

  Intercalary cell

  ঙ

  Oxyntic cell
• Cells present in mucosa associated lymphoid tissue are
  ক

  Plasma cell

  খ

  Macrophage

  গ

  Lymphocyte

  ঘ

  Mast cell

  ঙ

  Fibrocyte
• The lymph nodes
  ক

  Have a fine reticular networks of collagen fibers

  খ

  Have a peripheral capsular space

  গ

  Receive afferent lymph vessels at the hilus

  ঘ

  Have an inner densely packed medulla

  ঙ

  Are surrounded by an elastic capsule
• A lymph node
  ক

  Has a connective tissue frame work consisting of collagen

  খ

  Contain large number of lymphocytes and Macrophages

  গ

  Receives afferent lymphatic vessels

  ঘ

  Has its B lymphocytes in both the cortex and medulla

  ঙ

  Has its T lymphocytes mainly between the germinal center and the medulla
• Reasons for considering a primary lymphoid tissue rather than a secondary one are
  ক

  Lymphocytes proliferate here to increase in number

  খ

  Lymphocytes originally develop here

  গ

  Lymphocytes differentiate into particular type

  ঘ

  It is located in the central part of the body

  ঙ

  It gives rise to other lymphoid organs