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68C Ch.14 Ph.1 T.5

Hole's Essentials of A&P Chapter 14: Lymphatic Syst

What are the functions of the Lymphatic system? Remove excess fluid from interstitial spaces and return it to the bloodstream. Provide immunity from infection MO's, viruses, toxins, cancer cells
Name the two collecting ducts within the lymphatic system. a. Right lymphatic duct b. thoracic duct
Lymphatic capillaries extend into the interstitial spaces forming complex networks that parallel those of blood capillaries
lacteals lymphatic vessels in walls of the small intestine, absorb digestive fats, transport to venous circulation
Lymph nodes specialized organs along lymphatic pathways, contain large number of lymphocytes and macrophages
Major function of the lymph nodes filter potentially harmful particles from lymph before returning to bloodstream
Lymph tissue fluid that has entered lymphatic capillary, fluid movement through hydrostatic pressure
Thymus releases thymosin that stimulates the maturation of T cells
Spleen largest of the lymphatic organs, filters blood instead of lymph
Two types of pulp within the spleen White- contains many lymphocytes/white blood cells Red-old and fragile RBC's, blood in filtered within this space
Name the 2 Non-specific defenses 1.Mechanical Barriers 2.Chemical Barriers
Describe 1st Line of Defense (Mechanical Barriers) skin, hair, mucous membranes, respiratory tract, urinary system
Describe 2nd Line of Defense (Chemical Barriers) gastric juice, tears, salts from perspiration, interferons, inflammation, heat, pus, pain
What are interferons? bind to certain receptors of unaffected cells and stimulate proteins to block viruses
Describe 3rd Line of Defense (Adaptive Defensive) respond slowly, resistance to a particular pathogen, toxins or metabolic byproducts, use antigens to form antibodies
T-Cell Cellular immune response, killer cells attack cell directly with antigen bearing cells. Compose of 70-80% of circulating lymphocytes
Helper T-cells activate B cells to produce antibodies, antigen receptor combines with the displayed foreign antigen
Memory T-cells remember pathogens, immediately divide, yield more cytotoxic T cells
Formed in the red bone marrow, only 1 cell can form 1 type of antigen B cell
Antibodies are released into the lymph, transported to the blood then throughout the body to help destroy antigen-bearing agents Primary Immune Response
Antigen is encountered by memory cell, B cells enlarges and rapidly responds Secondary Immune Response
Describe the difference amongst Active immunity and Passive immunity. Active- acquired through development of antibodies from direct contact with pathogen Passive- acquired through direct introduction of antibodies for specific pathogen
Naturally acquired active immunity get sick, fight it off, build immunity
Artificially acquired active immunity exposure to dead, weakened pathogen, produces primary immune response ie vaccine
Naturally acquired passive immunity acquired by fetus from mother, last 6 months to year after birth
Artificially acquired passive immunity injection of antiserum, no time to develop active immunity
reaction is immune attack against non harmful substance, may damage tissues, delayed or immediate Allergic reaction
isoimmunity tissue transplants
autoimmunity failure to differentiate self from non-self antigen
Created by: ajwildasin30
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