Regeneration in Planaria and Multiple Fission

Also called

regeneration · planaria · flatworm · planaria cut into pieces · multiple fission · plasmodium · malaria parasite · budding · hydra · specialised cells · tissue organisation · asexual reproduction · पुनर्जनन · बहुखंडन · प्लेनेरिया

Topics

• If a Planaria is cut into pieces, each piece grows into a complete new animal: this is regeneration.
• Regeneration is done by specialised cells that multiply and then form the different cell types and tissues.
• Regeneration is not the same as reproduction: most animals cannot be cut up to make more of themselves.
• Hydra reproduces by budding: a bud on the body wall grows tentacles and detaches as a new Hydra.
• In multiple fission the nucleus divides many times first, then the cytoplasm splits round each nucleus.
• Plasmodium, the malaria parasite, divides by multiple fission inside red blood cells, making many cells at once.
• A complex animal has organs made of specialised tissues; a cut-off piece lacks the cells to build the rest of the body.

About this model

A GLB file of about 482 KB, shown in Lably's 3D viewer and, on a phone, placed in your room with AR. Credit: Model, science and animation: Lably (built procedurally with three.js; no downloaded meshes). | CC BY 4.0. Original geometry and animation made for Lably.

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