Lymphatic system

Question 1

What is it

Answer 1

it is part of the vascular system, 3 main functions- removes excess fluid and returns it to bloodstream, filters fluid to prevent infections of blood and tissues, aid digestion via the absorption of lipids from small intensteine
plays an important role in reducing oedema, maintain blood viscosity, and vascular homeostasis

Question 2

structure of lymph capillaries

Answer 2

lymph capillaries are blind ended and have mini flap like valves along their length
as the fluid which surrounds cells (tissue fluid) increases, the resultant pressure opens the way for it to pass into the lymphatic system- opening large enough to absorb large waste products

Question 3

passage og lymph

Answer 3

once tissue fluid passes into the lymphatic system it passes though a network of gradually increasing vessels in exactly the same manner as that of venous return
capillaries–vessels–trunks– after which it returns into the blood stream via ducts into the subclavian vein

Question 4

movement of lymph

Answer 4

peristalsis of smooth muscles walls of the vessels
pumping skeletal muscles
suction fro diaphragm
non return valves

Question 5

functions of lymph nodes

Answer 5

filter lymph
produce and store lymphocytes which fight infection
aids digestion via the absorption of lipids from small intestine

Question 6

positions of lymph nodes

Answer 6

sub mandibular, axillary, cubital, inguinal, popliteal

Question 7

spleen

Answer 7

locate din the upper elft abdomen- stores lymphocytes as aprt of immune response

Question 8

thymus

Answer 8

located against the trachea above the superior vena cava, prominent in infancy providing immunity, aids in lymphatic maturation, programmes T-cells (aggressive WBC)