THE LYMPHATIC SYSTEM.pptx

7/29/2019 THE LYMPHATIC SYSTEM.pptx

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THE LYMPHATIC

SYSTEM


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FORMATION OF INTERSTITIALFLUID

When blood flows from arteries intocapillaries, the hydrostatic pressure at the

arterial end of capillaries is high

This forces some fluid out through the

capillary walls into the intercellular spaces

This fluid is called interstitial or tissuefluid


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FORMATION OF INTERSTITIALFLUID

It is similar in composition to bloodplasma, but has NO erythrocytes,

platelets as these are too large to passthrough capillary walls


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IMPORTANCE OF INTERSTITIALFLUID

It forms the internal environment of thebody

It bathes the cells and supply them withtheir requirements --- O2 and nutrientswill diffuse from blood

Waste product (CO2 and urea) will diffuseout of the cells into the fluid


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FATE OF THE INTERSTITIAL FLUID

90% of the I.F. flows back into venousend of the capillary system the

hydrostatic pressure is low

Remaining 10% enters the lymphaticcapillaries and is called lymph

if excess I.F. is unable to return to theblood circ system, it will accumulate andcause tissue swelling OEDEMA


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STRUCTURE OF THE LYMPHATICSYSTEM

Part of the circulatory system and theimmune system

Consisting of a network of lymphaticvessels, ducts and nodes

No pump

lymph squeezed along thelymphatic vessels by pressure associatedwith movements of skeletal muscles andbreathing


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TLS starts from the minute blind-endedtubes - lacteals in the ileum & lymphatic

capillaries in tissues

Lymphatic capillaries joins to form larger

vessels

LYMPHATICS

Semilunar valves presents along thelymphatics


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Lymphatics from all parts of the body willform 2 large ducts right lymphatic

duct and thoracic duct

There were oval-shaped structures called

lymphnodes along the lymphatics

Large lymph nodes in the neck andarmpits


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Lymphocytes that produce antibodies arefound in the lymph nodes

Phagocytes in the lymph nodes help toremove bacteria


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ROLE OF THE LYMPHATIC SYSTEMIN TRANSPORT

To transport excess interstitial fluid back tothe blood before entering the heart

- The right lymphatic ducts open into the rightsubclavian vein

- The thoracic duct opens into the left

subclavian vein

Transports enzymes and hormones

Cholesterol enters the blood via the

lymphatic system

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THE LYMPHATIC SYSTEM.pptx