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Travaux pratiques _hématologie
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NUMERATION GLOBULAIREET
FORMULE SANGUINE
, Le sang est un tissu liquide composé de:
- Globules rouges 44%
- Globules blancs + plaquettes 1%
- Plasma 55%: constitué d’eau, des sels minéraux et
des molécules organiques (les immunoglobulines, les
facteurs de coagulation) .
- Chez un adulte sain: le volume est entre 5 à 6 l
- Rôles:
1- Transport: nutriments, gaz, déchets et hormones
2- Maintenir: la température corporelle, le pH normal
et le volume adéquat des liquides dans l’organisme.
3- Protection contre les infections
, Malgré leurs fonctions différentes, les cellules sanguines ont la même
origine au niveau de la moelle osseuse rouge des os par un mécanisme
de synthèse: l’Hématopoièse.
Cellules
Souches
Lymphoïdes
Lymphocytes B
Lymphocytes T CD4 Lymphocytes
Lymphocytes T CD8
Cellules
souches Mastocytes
Globules
Moelle Basophiles
blancs
osseuse
Eosinophiles Poly-
nucléaires
Neutrophiles
Cellules
Souches
Myéloïdes
Monocytes Macrophages
Plaquettes
Globules rouges
, Sang
Homme de 70 kg - 5 litre
Liquide Éléments figurés
Plasma Plaquettes
Globules
55% volume total (petites, plates)
(coagulation du sang)
Rouges (nombreux) Blancs (rares)
(hématies) (leucocytes)
(transport de gaz) (défense immunitaire)
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