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.
The human gas-exchange process transfers the gases contained by the human blood in exchange for the gases found in atmosphere. The human gas exchange process happens in the lungs and this process is accomplished by the mechanisms of the heart. The process of movement of the air in and out of the lungs is called ventilation. Humans have closed circulatory system or two-circuit circulatory systems, the pulmonary circuit and the systemic circuit.