Blood and Lymph 2 Flashcards Preview

Blood > Blood and Lymph 2 > Flashcards

Flashcards in Blood and Lymph 2 Deck (18):
1

monocytes: what? arrive when? do what?

highly mobile phagocytic cells. arrive at site shortly after neutrophils. release chemicals to attract other phagocytes, and fibroblasts (to make collagenous scar tissue)

2

lymphocytes: what type of immunity? 3 cell types

specific aka adaptive: will target specific antigens. T cells, B cells and NK cells.

3

platelets come from? found where?

megakaryocytes in bone marrow. 1/3 in spleen and other vascular organs, otherwise in blood

4

platelets: are what?

membrane bound enzyme packets that pinch off from cytoplasm of the megakaryocyte

5

body fluids: two categories?

intracellular (cytoplasm, nucleoplasm). extracellular: blood plasma and interstitial fluid

6

lymphatic system: 3 roles

produce/maintain/distribute lymphocytes. assist with maintaining normal blood volume. alternate route of transport of hormones, nutrients and metabolic waste

7

how does lymphatic system help maintain normal blood volume

vascular pressure forces water/solutes across capillary membrane into interstitial fluid, and lymph vessels return that fluid to the vasculature

8

lymph flow vs. blood flow

blood: actively pumped through vessels by heart. lymph: flows passively along pressure gradient, no pump.

9

lymphatic vessels: thickness? pressure? backflow?

vessels are very thin: system under super low pressure. lots of valves to prevent backflow

10

interstitial fluid: called ___when it enters ___? majority of cells are?

called lymph when it enters the lymphatic vessels. 99% cells are lymphocytes. 1% macrophages, eosinophils and neutrophils

11

lymphocytes: primary aka ___ structures do what? secondary aka __structures do what?

central: produce, maintain and store lymphocytes. peripheral:where most immune responses are initiated

12

primary central structures for lymphocytes: contain? lymphoid organs include?

contain stem cells to generate B, T and NK cells. bone marrow, thymus gland, spleen

13

largest lymphoid organ is the? function?

spleen: filters blood (removes abnormal blood cells by phagocytosis). stores iron recycled from metabolized RBCs. initiates immune response by B/T cells

14

lymph nodes: what? structure?

oval lymphoid organs from 1 - 25 mm in diameter. lots of afferent vessels penetrating a fibrous capsule, and a single efferent vessel exiting

15

lymph nodes: what do they do? where cells are located?

filter the lymph, remove 99% or more of antigens. T cells in cortex while B cells and macrophages are in the medulla

16

lymphoid tissue: what? two types?

connective tissues dominated by lymphocytes. can be diffuse, or nodules

17

diffuse lymphoid tissue: where

mucous membranes of respiratory and urinary tracts

18

lymphoid tissue nodules: what? where?

oval shaped aggregations of densley packed lymphocytes. mucosa of digestive tract like in tonsils, lining of small intestine aka peyer's patches and appendix