Minute pores of Kohn exist in the walls between adjacent alveoli permits airflow between adjoining alveoli collateral ventilation The alveolar walls consist of a single layer of flattened Type I alveolar cells (thin and wall forming) Type II alveolar cells secrete pulmonary surfactant, a phospholipoprotein complex that faciitates lung expansion Defensive alveolar macrophages are present within the lumen of alveoli exchange of O2 and CO2 takes place between the tissues and the blood by the process of diffusion across the sistemic capillaries O2 and CO2 are transported by the blood between the lungs and tissues 4. O2 and CO2 are exchanged between air in the alveoli and blood within the pulmonary capillaries diffusion 3.

air is alternately moved in and out of the lungs so that exchange of air can occur between atmosphere and the alveoli ventilation 2. external respiration encompresses 4 steps 1. Respiration - internal respiration intra cellular metabolic processes carried out within the mitochondria, which use O2 and produce CO2 IntroductionRemoves, modifies, activates, or inactivates various materials passing through the pulmonary circulation IntroductionNon respiratory function of the respiratory system - provides a route for water loss and heat elimination - enhances venous return - contributes to the maintenance of normal acid-base balance - enables speech,singing, and other vocalization - defends againts inhaled foreign matter IntroductionPrimary function of respiration to obtain O2 for use by cells and to eliminate CO2 the cells produce RESPIRATORY SYSTEMDepartement of Physiology Medical faculty of UNIVERSITAS SUMATERA UTARA

Fisiologi sistem respirasi