Definitions for lamellae

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  1. Lamellae

    of Lamella

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  1. Lamella

    A lamella is a thin plate-like structure, often one amongst many lamellae very close to one another, with open space between. Aside from respiratory organs, they appear in other biological roles including filter feeding, the traction surfaces of geckos, and chloroplast membranes where high permeability is important. In fish gills there are two types of lamellae, primary and secondary. The primary gill lamellae come out of the interbranchial septum to increase the contact area between the water and the blood capillaries. The secondary gill lamellae are small lamellae that come out of the primary ones and are used to further increase the contact area. Both types of lamellae are used to increase the amount of oxygen intake of the blood. Both types of lamellae contain huge amounts of capillaries and are the sites where the exchange of oxygen from the water and carbon dioxide from the blood occurs. Lamellae may also refer to the concentric circles around the central Haversian canals in the osteon of the bones.

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