The Illinois state sales tax rate is 6.25%, and the average IL sales tax after local surtaxes is 8.19%. Counties and cities can charge an additional local sales tax of up to 3.5%, for a maximum possible combined sales tax of 9.75%.
(clue: look up Hirschsprung's disease.) The first important step in development of the digestive system occurs during folding of the embryonic disc as neurulation takes place (weeks 4 and 5) - the thin endodermal layer is gathered up' inside the embryonic body to form a tubular structure. Gut tube, respiratory diverticulum, yolk sac, and allantois.
The mucosa is the innermost layer of the gastrointestinal tract. that is surrounding the lumen, or open space within the tube. 1  This layer comes in direct contact with digested food (chyme). The mucosa is made up of: 2  Epithelium â innermost layer. Responsible for most digestive, absorptive and secretory processes.