11. After metamorphosis, these organs become redundant and will be resorbed by controlled cell death, called apoptosis. 12. As the larvae mature and metamorphose, their limbs with digits become visible and the gills are resorbed . 13. By the time the embryo is across, it has fully resorbed its yolk sac and external gills. 14. The combined material, called mineralized collagen, is resorbed by the body and filled in by natural bone. 15. Bones are continually being remodeled; they are resorbed under the influence of cells called osteoclasts and then rebuilt by osteoblasts. 16. Also, symptoms may be transient as the embolus is partially resorbed and moves to a different location or dissipates altogether. 17. Newts'gills are never covered by a gill sac and will be resorbed only just before the animal leaves the water. 18. Bone is constantly being broken down ( resorbed is the medical word ) by cells called osteoclasts and rebuilt by cells called osteoblasts. 19. All the while, bone is continually replenishing itself as old bone is broken down or resorbed and new bone tissue is formed. 20. The trabecular bone is first resorbed by osteoclasts, creating a shallow resorption pit known as a " Howship's lacuna ".
