[Trachea, monkey; x-section, PTS]. The lumen of the trachea is lined by pseudostratified columnar epithelium. Note that all the surface cells have cilia at their free (apical) surface.(What function do these cilia serve in the trachea?) Mucus-secreting unicellular gland cells (goblet cells) are interspersed among the ciliated cells.Trachea, monkey; x-section, PTS]. The lumen of the trachea is lined by pseudostratified columnar epithelium. Note that all the surface cells have cilia at their free (apical) surface.
Complex Carbs on Restrictive Low-Carb Diets. If you're on a restrictive low-carb diet, you may be limited to just 20 grams of net carbs per day. That excludes virtually any food rich in complex carbohydrates, as a single serving of any of the previously mentioned foods contains more than your daily limit.
Each carbohydrate exchange is worth about 15 grams of carbohydrate, so if you need 200 grams of carbohydrates each day, your total of carbohydrate exchanges for the day should be 13. Everything you eat has a certain number of carbohydrate choices. Foods that don't contain any carbohydrates (or less than 5 grams) have a choice of zero. Foods that are high in sugar or starches are equal to more exchanges compared to foods that have fewer carbs.