Blood
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Life span:<br />
١٠-٥<br />
days .<br />
• Function -:<br />
• Stop bleeding (haemostasis) through :<br />
1-Secretion of serotonin vasconstriction<br />
.decrease blood loss<br />
2-The platelets adhere to the inner wall of the<br />
injured blood vessels forming platelet<br />
aggregation or white thrombus.<br />
3-Then, they secrete thromboblastin change<br />
into thrombin prothrombin change<br />
attract RBCs fibrinogen into fibrin network<br />
which )coagulation(to form red thrombus<br />
.close blood vessels and stop bleeding<br />
Dr. Amal M. Moustafa, , Department of Histology & Cytology
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