(12) http://commons.wikimedia.org/wiki/File:Basket_sky.JPG. Public Domain.
(13) NIH.http://commons.wikimedia.org/wiki/File:Redbloodcells.jpg. Public
Domain.
(14) CK-12 Foundation.
http://commons.wikimedia.org/wiki/File:Coombs_test_schematic.png.
GNU-FDL.
(15) http://commons.wikimedia.org/wiki/File:Sicklecells.jpg. Public Domain.
(16) http://en.wikipedia.org/wiki/Image:Illu_spleen.jpg. Public Domain.
(17) http://commons.wikimedia.org/wiki/File:Illu_vein.jpg. Public Domain.
(18) CK-12 Foundation.http://commons.wikimedia.org/wiki/File:Aorta.jpg. Public
Domain.
(19) Joshuajohnlee.http:
//upload.wikimedia.org/wikipedia/en/f/f6/Double_circulatory_system.jpg.
Public Domain.
(20) http://commons.wikimedia.org/wiki/File:Red_White_Blood_cells.jpg. Public
Domain.
(21) K-12 Foundation. http://en.wikipedia.org/wiki/Image:Heart_systole.svg.
(b)GNU-FDL.
(22) Julo.http://commons.wikimedia.org/wiki/File:BloodPressure.jpg. Public
Domain.
(23) Obli.http://commons.wikimedia.org/wiki/File:Macrophage.jpg. CC-BY-SA 2.0.
(24) http://commons.wikimedia.org/wiki/File:
Atherosclerosis,_aorta,_gross_pathology_PHIL_846_lores.jpg. (a)CC-BY
(b)Public Domain.
(25) http://commons.wikimedia.org/wiki/Image:Blutkreislauf.png. CC-BY-SA 2.5.
