Dallas College
BIOL 2401 A&P II Lecture Exam 3 — Collin
College Questions and Answers 2026 Latest
Update
Lymphoid tissues Ans: Monitor peripheral infections and respond
before infections reach vital organs.
Lymph node function Ans: Purify lymph before return to venous
circulation.
Antigens Ans: Released due to infection, enter lymph and
stimulate macrophages and lymphocytes in lymph nodes.
Dendritic cells Ans: Carry antigens to lymph nodes.
Lymph flow through nodes Ans: Flows from subcapsular space
through outer cortex, paracortex, and medulla.
Subcapsular space Ans: Contains macrophages and dendritic cells.
Outer cortex Ans: Contains B cells within germinal centers.
Paracortex Ans: Dominated by T cells.
Core (medulla) Ans: Organized into medullary cords containing B
cells and macrophages.
Efferent lymphatics Ans: Final destination of lymph flow at hilum.
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, Lymph nodes of gut, trachea, lungs, thoracic duct Ans: Protect
against pathogens in digestive and respiratory systems.
Largest lymph nodes Ans: Located in groin, axillae, and base of
neck; swell in response to infection.
Lymphadenopathy Ans: Chronic or excessive enlargement of
lymph nodes; may indicate infections or cancer.
Thymus Ans: Located in mediastinum, atrophies after puberty,
diminishing effectiveness of immune system.
Thymic lobes Ans: Divided into two lobes, with septa dividing
lobes into smaller lobules.
Thymic lobule Ans: Contains a dense outer cortex and a pale
central medulla.
Lymphocytes Ans: Divide in cortex, migrate into medulla, and
mature T cells leave thymus by medullary blood vessels.
Epithelial reticular cells Ans: Surround lymphocytes in cortex,
form thymic corpuscles, and maintain blood thymus barrier.
Thymic hormones Ans: Thymosin—an extract from thymus
containing several hormones that promote development and
maturation of T cells.
Functions of the spleen Ans: 1. Removal of abnormal blood cells
and other blood components by phagocytosis; 2. Storage of iron
recycled from red blood cells.
Initiation of immune responses Ans: Triggered by B cells and T
cells in response to antigens in circulating blood.
© 2025 All rights reserved
BIOL 2401 A&P II Lecture Exam 3 — Collin
College Questions and Answers 2026 Latest
Update
Lymphoid tissues Ans: Monitor peripheral infections and respond
before infections reach vital organs.
Lymph node function Ans: Purify lymph before return to venous
circulation.
Antigens Ans: Released due to infection, enter lymph and
stimulate macrophages and lymphocytes in lymph nodes.
Dendritic cells Ans: Carry antigens to lymph nodes.
Lymph flow through nodes Ans: Flows from subcapsular space
through outer cortex, paracortex, and medulla.
Subcapsular space Ans: Contains macrophages and dendritic cells.
Outer cortex Ans: Contains B cells within germinal centers.
Paracortex Ans: Dominated by T cells.
Core (medulla) Ans: Organized into medullary cords containing B
cells and macrophages.
Efferent lymphatics Ans: Final destination of lymph flow at hilum.
© 2025 All rights reserved
, Lymph nodes of gut, trachea, lungs, thoracic duct Ans: Protect
against pathogens in digestive and respiratory systems.
Largest lymph nodes Ans: Located in groin, axillae, and base of
neck; swell in response to infection.
Lymphadenopathy Ans: Chronic or excessive enlargement of
lymph nodes; may indicate infections or cancer.
Thymus Ans: Located in mediastinum, atrophies after puberty,
diminishing effectiveness of immune system.
Thymic lobes Ans: Divided into two lobes, with septa dividing
lobes into smaller lobules.
Thymic lobule Ans: Contains a dense outer cortex and a pale
central medulla.
Lymphocytes Ans: Divide in cortex, migrate into medulla, and
mature T cells leave thymus by medullary blood vessels.
Epithelial reticular cells Ans: Surround lymphocytes in cortex,
form thymic corpuscles, and maintain blood thymus barrier.
Thymic hormones Ans: Thymosin—an extract from thymus
containing several hormones that promote development and
maturation of T cells.
Functions of the spleen Ans: 1. Removal of abnormal blood cells
and other blood components by phagocytosis; 2. Storage of iron
recycled from red blood cells.
Initiation of immune responses Ans: Triggered by B cells and T
cells in response to antigens in circulating blood.
© 2025 All rights reserved
