(15) CK-12 Foundation. http://en.wikipedia.org/wiki/Image:Glanzstreifen.jpg
http://commons.wikimedia.org/wiki/Image:
Skeletalmuscle-_longitudinal_section.jpg
http://commons.wikimedia.org/wiki/File:Glatte_Muskelzellen.jpg.
(a)CC-BY-SA 2.0 (b)GNU-FDL (c)GNU-FDL (d)GNU-FDL.
(16) http://en.wikipedia.org/wiki/Image:Fingernail_label.jpg. Public Domain.
(17) http://www.flickr.com/photos/goldenswamp/2152200871/http://training.
seer.cancer.gov/module_anatomy/unit2_2_body_tissues1_epithelial.html
http://commons.wikimedia.org/wiki/File:
Compactbone-_ground_cross_section.jpg
http://commons.wikimedia.org/wiki/File:
Skeletalmuscle-_longitudinal_section.jpg. (b)License: CC-BY-SA 2.0; (c)
License: Public Domain;(e) License: GNU-FDL.
(18) Photocopy.
http://commons.wikimedia.org/wiki/File:WM06_ASA-UKR_Warm_Up.jpg.
CC-BY-SA 2.0.
(19) Northfield.org.http://www.flickr.com/photos/northfield_mn/188277425/.
CC-BY-NC-SA.
(20) http://commons.wikimedia.org/wiki/File:Skin.jpg. Public Domain.
(21) Michael Müller-Hillebrand.http://commons.wikimedia.org/wiki/File:
Fracture_of_Olecranon_pre_and_post_typical_surgery.jpg. CC-BY 3.0.
(22) http://en.wikipedia.org/wiki/Image:Querbr%C3%BCckenzyklus_2.png
http://en.wikipedia.org/wiki/Image:Querbr%C3%BCckenzyklus_3.png
http://en.wikipedia.org/wiki/Image:Querbr%C3%BCckenzyklus_4.png
http://commons.wikimedia.org/wiki/Image:ATP_symbol.svg. CC-BY-SA.
(23) Ildar Sagdejev.
http://commons.wikimedia.org/wiki/File:2003-09-17_Goose_bumps.jpg.
CC-BY-SA 3.0.
(24) Niamh Gray-Wilson.. CC-BY-CA.
(25) CK-12 Foundation.
http://commons.wikimedia.org/wiki/File:Gelenke_Zeichnung01.jpg.
(a)CC-BY 2.5 (b)GNU-FDL.
(26) David B. Gleason.http://www.flickr.com/photos/mindfrieze/764505669/.
CC-BY-SA 2.0.