Transcript Lymphatic System PPT

The Lymphatic System
Lymph
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Straw-colored fluid (similar
to plasma)
INTERSTITIAL FLUID or
tissue fluid because it is in
the spaces between cells
Composed of H2O,
lymphocytes, some
granulocytes, O2, digested
nutrients, hormones, salts,
CO2 and urea.
Lymph
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NO red blood cells or
protein molecules (too
large)
Carries digested food,
O2 and hormones to
cells
Carries wastes back to
capillaries for excretion
Since the lymphatic
system has no pump,
skeletal muscle action
squeezes lymph along
Valves prevent backward
flow
Function of Lymph
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LYMPH –
fluid that
goes
between
capillary
blood and
tissues
Lymph flows
only in one
direction –
from body
organs to the
heart.
Lymph Vessels
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Closely parallel veins
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Located in almost all tissues and
organs that have blood vessels
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Tissue lymph enters small lymph
vessels which drain into larger
vessels called lymphatics – they
flow into one of two large, main
lymphatics – the THORACIC
DUCT and right lymphatic duct.
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FUNCTION OF LYMPH
VESSELS – transport excess
tissue fluid back into circulatory
system.
Lymph
Drainage
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THORACIC DUCT gets
lymph from left side of
chest, head and neck,
abdominal area and lower
limbs  left subclavian vein
 superior vena cava 
heart.
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RIGHT LYPHATIC DUCT
gets lymph from right side of
chest, head, neck, and right
upper extremity  right
subclavian vein  superior
vena cava  heart.
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Tiny, oval shaped - size of
pinhead to size of almond
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Some are located alone but
most are grouped
(submandibular, cervical,
axillary, inguinal, etc.)
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Site for white cell
production and filter for
screening out harmful
substances
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If substance can’t be
destroyed, node becomes
inflamed
Lymph Nodes
Inflamed Lymph Node
Function of Lymph Nodes
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LYMPH NODES
– produce
lymphocytes,
filter out harmful
bacteria.
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Masses of lymphatic
tissue that produce
lymphocytes and filter
bacteria – they get smaller
in size as person gets
older
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PALATINE TONSILS –
sides of soft palate
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ADENOIDS – tonsils on
upper part of the throat
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LINGUAL TONSILS back of the tongue
Tonsils
Spleen
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Sac-like mass of lymphatic
tissue – largest lymphoid
organ in the body
Upper left abdominal cavity,
lateral to the stomach
Forms lymphocytes and
monocytes
Filters blood
Stores large amounts of
RBCs (over a pint) – contracts
during vigorous exercise or
loss of blood, to release RBCs
Destroys or removes old or
fragile RBCs
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Upper, anterior thorax,
above the heart
Thymus is also
considered an
endocrine gland
Largest at puberty
Forms lymphocytes
before birth involved in
the development of “TLymphoctes or TCells.”
Completes is work by
puberty and is replaced
by fat (this is called
involution)
Thymus Gland