1 Icaridin is considered to be the repellent of first choice by the Public Health Agency of Canadaâs Canadian Advisory Committee on Tropical Medicine and Travel for travellers six months to 12 years of age. 2  Products containing up to 20% icaridin are considered to be safe and efficacious.
Food, mixed with saliva, is formed into a bolus (7) and pushed by the tongue (8) into the pharynx. During swallowing (A, B) the soft palate (9) blocks entry to the nose and the epiglottis closes. The digestive system is the organ system that includes the gastrointestinal tract (GI tract) and its accessory organs. The digestive system processes food into molecules that can be absorbed and utilized by the cells of the body.
In the digestive system, absorption means the uptake of digested food into the blood.   Diffusion is one way in which food can be absorbed into the blood. If the conc â¦ entration of food is higher in the intestine than it is in the blood, food can diffuse down the concentration gradient into the blood.   If the concentration of food is lower in the digestive system than in the blood then it cannot be absorbed by diffusion.