Human T lymphocytes and activated platelet, SEM

Numéro d’image : 12298173
Human T lymphocytes and activated platelet, SEM
Human T lymphocytes (pre-T cells) and activated platelet, coloured scanning electron micrograph (SEM). Lymphocytes are involved in the specific immune response and are composed mainly of precursor T cells (pre-T cells) and B cells. Pre-T cells circulate in the blood before migrating to the thymus where they develop into helper T cells or killer T cells that are able to identify antigens and infected cells. Platelets are blood cell fragments that play an essential role in blood clotting and wound repair. Platelets in the blood are small oval disks and are termed non-activated. When an injury such as a cut is sustained, platelets become activated, change their shape, become sticky and build up on a vessel wall to form a plug. They are also involved in the secretion of a chemical platelet factor which helps produce threads of fibrin. Bloods cells collect in the entangled fibrin and platelet mass forming a blood clot at the site. Magnification: x2, 200
Licence : Droits gérés
Crédit: Science Photo Library / DENNIS KUNKEL MICROSCOPY
Taille de l’image : 2726 px × 3206 px
Model Release : Non requis
Property Release : Non requis
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