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L’IMMUNITE DE L’ORGANISME

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providing a detailed summary about the Immune system

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Secondary school
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High school
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Uploaded on
November 18, 2025
Number of pages
8
Written in
2024/2025
Type
Class notes
Professor(s)
Maher chtiuoui
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All classes

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L’IMMUNITE DE L’ORGANISME

Réponse immunitaire non spécifique Réponse immunitaire spécifique
RINS RIS


Cellules effectrices : les phagocytes exp : les Cellules effectrices : les LB et les LT
macrophages

La phagocytose




ou bien




Le phagocyte est une cellule infectée = cellule
présentatrice de l’antigène : CPAg
 La RINS se présente inefficace.
 Les cellules de la RIS : les lymphocytes seront activés
par la reconnaissance de l’antigène => 1er signal
d’activation


La RINS est dite efficace
 La réponse immunitaire est terminée par guérison du sujet


1

, LES MARQUEURS DU SOI
Les marqueurs des cellules anucléées = Les hématies
= > ce sont des glycoprotéines membranaires à la surface des hématies <= Système Rhésus
Système ABO
Antigènes = agglutinogènes
Antigène Rh
Antigène A Antigène B
Présence du Rh Absence du Rh
(Rh+) (Rh-)
4 groupes sanguins
 Le système ABO + le système Rh nous
donnent 8 groupes sanguins
Compatibilité
des groupes
sanguins




 Les anticorps ou agglutinines = dirigés contre certaines molécules
(antigènes) présentes à la surface des globules rouges ce sont les
Anti – A et Anti – B.
 L’agglutination : Réaction spécifique de défense de l'organisme,
caractérisée par le rassemblement en petits amas de globules
rouges. Exemple : Ag-A + anti –A ou Ag-B + anti –B 
Agglutination
2
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