BIO 446L Exam 4 Lymphoid Tissues Review Questions and Correct Answers
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Course
BIO 446
Institution
BIO 446
Lymph vessels -interstitial fluid gives rise to lymph vessels vessels that receive lymph from the lymph capillaries and circulate it to the lymph nodes. There are 2 major lymphatic vessels that drain into the vascular system; -right lymphatic duct: only drains into the right side of head and right ...
BIO 446L Exam 4 Lymphoid Tissues
Review Questions and Correct Answers
Lymph vessels ✅-interstitial fluid gives rise to lymph vessels
vessels that receive lymph from the lymph capillaries and circulate it to the lymph
nodes. There are 2 major lymphatic vessels that drain into the vascular system;
-right lymphatic duct: only drains into the right side of head and right upper limb
-Thoracic duct: not only drains into left head and upper limb but all the abdominal and
lower limbs
lymph circulation from small intestines ✅
thymus role in lymphatic system ✅Thymus is the site of T cell maturation and selection
T-Cells that we need to know:
- Helper cells
-Cytotoxic T cells (deals with virus and cancer cells)
-Naive T cells proceed to the thymus and go through a selection process: T-cells must
have T-cell receptors, it removes T-cells that react against self antigens and T-cells that
do not react to antigens
innate response ✅-fast and non-specific
- Neutrophils, macrophages, mast cells, NK cells
adaptive response ✅-requires initial recognition by B and T cells, slower, specific,
complex
- produces memory cells which will respond quickly to future exposures to an antigen
humoral response ✅antobodies produces by plasma cells which in turn are produced
by activated B-lymphocytes
cellular response ✅-mediated by T-lymphocytes: secrete cytokines that activate B-cells
and other T cells along with inflammatory cells like macrophages like neutrophils and
attack foreign cells or cells infected cells by viruses or parasites
-invoves antigen presenting cells and helper t-cells
Antigen-presenting cells (APCs) ✅•Include macrophages, dendritic (Langerhans) cells,
and B-lymphocytes
•Capture antigens
•Are recognized by helper T-cells as friendly and share the captured antigen with them.
•This interaction results in a complex immune response
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