Red blood cells (erythrocytes). This image of human red blood cells obtained by scanning electron microscopy, revealing their characteristic biconcave shape.

Scanning electron micrograph of the lumenal surface of the toad bladder shows the boundaries of four polygonal squamous epithelial cells surrounding a mitochondrial-rich cell bearing short globular mi...

Scanning electron micrograph of the epidermal surface of the Pacific coho salmon. Ridge-like folds of the plasmalemma, called microplicae, display a labyrinth pattern across the surface, and a circum...

Scanning electron micrograph of the epidermal surface of lamprey larvae. A row of microvilli outline the polygonal borders between cells, while short microvilli cover the external surface in a reticu...

The final stages of cell division is captured in the scanning electron micrograph. Two daughter cells are still interconnected by slender strands of membrane (white arrow at center of image). Lamell...

Scanning electron micrograph showing the tip of a Hydra viridis tentacle. A meshwork of triggered nematocyst cells is visible. When hooked cnidocytes on the surface of the tentacle come in contact wit...

Scanning electron micrograph showing tentacles on the head of a Hydra viridis. Epithelial cells located at the base of the tentacle are in a flat, contracted state. Cell distal to the head of the H. v...

Apical oral view of Didinium. Showing the proboscis containing extrusive organelles to demobilize and eventually engulph it's prey. Metachronous waves of cilia in the anterior girdle of the two charac...

Didinium ingests Paramecium. Also showing a few discharged trichocysts and metachronous waves of cilia in the two characteristic ciliary girdles of Didinium nasutum. This micrograph was taken in 1968 ...

The proboscis of Didinium. While not well preserved, this image clearly shows the clockwise surface ridges that are elevated by ribbons of microtubules that are involved in supporting the buccal cavit...