Advanced Biology Chapter 21 Lymphatic System
Arteries lymphatic vessels (lymphatics)
It is a one way system back to the heart See page 745 Vessels contain "check valves"
Plasma and other fluids leak out of blood capillaries (interstitial fluid) Interstitial fluid enters the lymphatics (lymphatic vessels)
Right Lymphatic Duct: Drains lymph from the right upper arm and right side of head and thorax
Thoracic Duct: Much Larger, Drains rest of body See page 747
Internal Jugular Vein Subclavian Vein At the Junction See page 747
Red Bone Marrow T Lymphocytes – Killer T, Helper T B Lymphocytes - Antibodies
Lymphoid (Lymphatic) Tissue Body Protection Immune Response (activate T cells)
Lymphoid (Lymphatic) Tissue Proliferation site for lymphocytes Ideal surveillance vantage point for lymphocytes and macrophages
Lymphoid (Lymphatic) Tissue Embedded in connective tissue Inguinal, axillary, cervical
Two Basic Functions: Lymph filters – phagocytic macrophages in nodes remove and destroy microorganisms Activate Immune System
Organs of the Lymphatic System Lymphocyte proliferation Filter system
Spleen Stores breakdown products of RBCs Erythrocyte production in fetus Stores blood platelets
Thymus T cell maturation, become immunocompetent. Does not directly fight antigens Stroma secretes hormones for T cells to become immunocompetent.
Tonsils Gather/Remove pathogens from food, air, etc in pharynx
Aggregates of Lymphoid Nodules Peyer’s Patches, appendix? Part of MALT – Mucosa- Associated Lymphatic Tissue Help patrol intestines and help generate memory