Posterior Pituitary Gland

Structural diagram of oxytocin, showing its cyclic peptide backbone, disulfide bond, and labeled residues.

Oxytocin

Diagram of the pituitary gland showing the anterior and posterior pituitary, pituitary stalk, sella turcica, and basilar artery.

Posterior Pituitary Endocrine Function

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Microscopic image showing pink-stained simple cuboidal epithelial cells lining irregular tubular spaces.
Tissue Structure

Epithelial cells

by Charlotte Smith

Diagram and micrograph of hyaline cartilage showing chondrocytes in lacunae within a surrounding matrix.
Tissue Structure

Cartilage

by Phoebe Parker

Graph comparing immune responses: a large, slower initial response, a smaller faster response after inapparent reinfection, and a sharp rapid response after mild or inapparent reinfection, with memory persisting over years.
Adaptive Immune System

T Cell Memory

by Emily Crawley