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Quantitation of changes in cell shape using computerized image analysis demonstrated that PDGF doubled the total projected area of lamellipodia formed by each cell within 5 min of addition and increased it by almost 10-fold at 30 min (Fig. 3 â A).o determine relative changes in lamellipodia length in different regions of the cell, corners were defined as parts of the square perimeter within 6 Î¼m from the intersection of the two sides; sides were defined as the 18 Î¼m interval between these corner regions.
The gill filaments of bony fishes (also known as a primary lamellae) are complex structures which have a large surface area. Off each are numerous smaller secondary lamellae. Tiny blood capillaries flow through the secondary lamellae of each gill filament.The direction of blood flow is opposite to that of water flow.ill arches : Most fishes have gill arches. They are the boomerang-shaped bony or cartilaginous structures that support the gills. Each gill arch comprises an upper and a lower limb that are joined posteriorly. Attached to the gill arches are the gill filaments and gill rakers.