Bones

Bone Ossification

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Flowchart showing ketone body formation: two acetyl-CoA molecules form acetoacetyl-CoA, then HMG-CoA, and acetoacetate, which branches into beta-hydroxybutyrate and acetone.
The Liver

Lipid Metabolism in the Liver

by Dr. Danny Stevens

Illustration of the retina’s layered structure, labeling the optic nerve, retinal cell types, retinal pigment epithelium, choroid, and sclera.
Ocular Physiology

The Retina

by Teerajet Taechameekietichai, Rose-Anne Nunoo and Darshigaa Gurumoorthy

Diagram showing protein breakdown by the proteasome into peptides, their transport by TAP into the endoplasmic reticulum, loading onto MHC class I, and movement through the Golgi and secretory vesicles to the cell surface.
Adaptive Immune System

Antigen Processing and Presentation

by Antonia Round