Farbgrafik
1: Blutfluss, 2: Klappe. Querschnittsdiagramm einer Vene mit Klappen.
(CC BY-derivative work: Mouagip (talk) SA 3.0
Farbgrafik
CC BY-A-kreislauf01.jpg: Jörg Rittmeister
derivative work: Vezixig
SA 2.5
http://creativecommons.org/licenses/by-sa/2.5/deed.de
Schwarz-weiß-Foto
Microvessel showing an erythrocyte (E), a tunica intima of endothelial cells and a tunica adventitia of pericytes.
(CC BY Robert M. Hunt 3.0
Farbgrafik
This slide shows the arterial and venous blood circulation of the pulmonary system.
CC BY Artwork by Holly Fischer
3.0
http://creativecommons.org/licenses/by/3.0/deed.de