1.4TheLymphaticSystem

7/21/2019 1.4TheLymphaticSystem

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Thank You// Credits iGotcha.Prepared b !mma.

Pictures and diagram from Google "mage.

#ased on the "ntegrated Curriculum for $econdar $chools. %#$&.

#iolog Form '( Chapter )*Transport(

).+*The ,mphatic $stem

)-Formation of interstitial fluid

#lood enters the arterial end of capillaries is under high pressure ( the pressure is sufficient to cause fluid leak

continuousl from blood to spaces beteen cells.

What is interstitial fluid?Fluid that fills the spaces beteen the cells.

0- Composition of interstitial fluid.

"nterstitial fluid consists of:

1 ater 1 dissolved nutrients1 hormones1 aste products1 gases1 small protein from blood1 leucoctes 2 that can oo3e through the openings beteen the capillaries cells -

"nterstitial fluid does not consists 2 because the are T44 ,56G! to pass through capillaries-:1 plasma proteins 2 albumin( fibrinogen( globulin -1 erthroctes1 platelets

3) Importance of interstitial fluid

a- "mportant to cell because through this fluid that e7changes material beteen blood capillaries 8amp9 cells occurs.

b- utrient 8amp9 o7gen diffuse through interstitial fluid into bod cells.

c- Carbon ;io7ide and aste product diffuse through interstitial fluid into the blood.
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4) Fate of interstitial fluid


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5) Structure of lymphatic system

What is lymph?

"nterstitial fluid that are not absorb back to the bloodstream drains into the ,Y&P C5P",,56"!$. This collected fluid

is knon as ,mph. ,mph is a transparent elloish fluid.

Lymph also contain tiny droplets of lipids.

*The intestinal lining of the small intestine is covered b villi

*villi contain lacteals

*lacteals are lmph capillaries 2droplets of lipid and fat*soluble vitamins are transported to the bloodstream-

Lymphatic system>

*Collect most of the e7cess interstitial fluid 2lmph- from the spaces beteen the cells and returns it to the circulator

sstem.

*is a netork of lmph capillaries and larger vessels.

Lymph capillaries* are blind*ended tubes or closed at one end.

* located in spaces beteen cells.

*interstitial fluid hich is not absorbed into the bloodstream drains into these capillaries.

Lymphatic vessels

*lmph capillaries unite to form this lmphatic vessels.

*valves are found toi- ensure the continuous flo of the lmph aa from the tissues.

ii- prevent backflo of lmph


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2image of lmphatic vessel-

Lymph Nodes

*located at intervals along the lmphatic vessels.

* produce and store lmphoctes.

*defend the bod against infection.

Lymphatic system does not have its pumps to move the lymph around through the lymphatic vessels.

"t moves forard the subclavian veinswith the helpof:*

i- one*a valves(

ii- muscular contractioniii- intestinal movements( and

iv- pressure changes that occur during inhalation and e7halation.

6) How lymphatic system complements the circulatory system?

5ccording to an e7ample in


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From the lmphatic vessels( lmph ill eventuall passes one of to main channels hich is either:

a- Thoracic duct( or

b- 6ight lmphatic duct.

) !ole of the lymphatic system in transport

* carr e7cessive interstitial fluid back to the bloodstream

*helps to maintain the balance of fluid in bod

*the process is crucial because ater( nutrients and other molecules continuousl leak out of blood capillaries into the

surrounding bod tissues.

") If interstitial fluid not return to the circulatory system# will cause

*sollen of bod tissues 2 because too much fluid is retained-

*4edema 2 condition of e7cessive accumulation of interstitial fluid in the spaces beteen the cells( cause b ablocked lmphatic vessel-

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1.4TheLymphaticSystem