A&P 2 L4 Flashcards
(118 cards)
Fluid that the lymphatic vessels carry
Lymph
Mass of lymphoid tissue located along the course of a lymphatic vessel
Lymph node
Type of white blood cell that provides immunity; B cell or T cell
Lymphocyte
Composed of 3 layers: an endothelial lining, a middle layer of smooth muscle/elastic fibers & outer layer of CT
similar to veins but thinner
Lymphatic vessels
What drains lymph from the lymphatic vessels?
Lymphatic trunk
Microscopic, closed-ended tubes; forms complex networks with the blood capillaries; picks up plasma
Lymphatic capillaries
What are the 2 main collecting ducts
Thoracic duct & right lymphatic duct
Larger, longer of the 2 collecting ducts; originates in the abdomen; empties in the left subclavian vein
Thoracic duct
Originates in the right thorax; empties in the right subclavian vein
Right lymphatic duct
What happens after the lymph empties in the collecting ducts?
It’s now called plasma; returns to the right atrium
Where does the lymph from the lower body region enter
Thoracic duct
Where does the lymph from the right side of the head & neck enter
Right lymphatic duct
What moves lymph through the lymphatic system
Hydrostatic pressure, osmotic pressure & valves
Blood vessels & nerves join a lymph node through the indented region of the node
Hilum
What type of lymphatic vessels leads a node at various points on its convex surface
Afferent vessels
What type of lymphatic vessel leaves the node from the hilum
Efferent vessels
Allergy-causing agents (non-living); dust; pollen; food
allergens
Any response given by a lymphocyte to an antigen
Immunity
A particular antigen; antibiotics for staph/strep; vaccination shot
Specific
Covers a whole wide range; broad group
Non-specific
Any substance to which a lymphocyte shows a response; bacteria in body
Antigens
What are the 2 groups of antigens
Pathogens & allergens
Disease-causing agents (living organism); viruses; protozoans; bacteria; fungi
Pathogens
What attacks viruses & tumor; malignant/beign?
Interferon