The Alveolar Sacs are a series of membrane-enclosed sacs, known as Alveoli, that provide calcium storage to the cell. They are located between the Plasma Membrane and the Epiplasm, with each flat sac arranged in a single layer next to each other beside sites where mucocysts, cilium, or parasomal sacs are located.
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Alveolar Sac
Alveolar Sac
Image depicts a large accumulation of peroxisomes and a food vacuole within a Tetrahymena cell. Credited to Professor Richard Allen and his Image Collection, permission to use image collection granted by Hawaii University.