Diffusion
Oxygen, carbon dioxide, and water are the substances exchanged  between the alveoli (air sacs) and the capillaries in the lungs. Confidence votes 174. Capillaries pick up oxygen and nutrients from the alveoli, while the alveoli picks up carbon dioxide and waste from the capillaries. There're the places where gas exchange takes place. The PO 2 in the alveoli is still higher than that in the capillaries, so oxygen diffuses into the blood. Once through the alveolar and capillary walls, the oxygen combines with haemoglobin to form oxyhaemoglobin and is transported within the bloodstream. Gas exchange between the air within the alveoli and the pulmonary capillaries occurs by diffusion. The oxygen must first dissolve before passing through the respiratory epithelium. Gas moves from a region of high partial pressure to a region of low partial pressure, down a partial pressure gradient Gas exchange in the lungs takes place between the blood in the capillary network surrounding the alveoli, and the air in the alveoli itself. All of the blood from the right ventricle flows through the pulmonary artery to the capillary network which surrounds the alveoli. Gas exchange between the air within the alveoli and the pulmonary capillaries occurs by diffusion. The oxygen must first dissolve before passing through the respiratory epithelium. Gas moves from a region of high partial pressure to a region of low partial pressure, down a partial pressure gradient The lungs expand as the alveoli fill up with air. The concentration of oxygen in the air of the alveoli is higher than the concentration of oxygen in the blood inside the capillaries, which results in oxygen diffusing from the alveoli into the capillaries. At the same time the carbon dioxide level in the capillaries is high and low in the lungs. So carbon dioxide also diffuses, but in the opposite direction! (carbon dioxide leaves the capillaries and goes into the alveoli) When a person exhales the lungs decrease in size as the air rushes out. i am doing a project on the respiratory system and i need to know what happens between the alveoli and the capillaries in the breathing cycle. Follow. 2 answers 2. Report Abuse. Gaseous exchange between the blood and air takes place in the alveoli, but the detailed structure of the alveolar walls cannot be resolved with the light microscope. This shows a photograph of a section of adult lung. The air spaces are within 0.2µm of the blood, which is a very thin barrier to diffusion. This arrangement means there is a fast efficient transfer of oxygen and carbon dioxide between the blood and the air, the major function of the respiratory portion. The terminal bronchioles branch to give rise to respiratory bronchioles, which lead to alveolar ducts, alveolar sacs and alveoli The singular word of the alveoli is the alveolus where the only difference in between these two words. Alveoli. The respiratory system comprises the nasal cavity, nasopharyx, larynx, trachea, bronchial tree, and at the end, terminal dilatations forming the alveoli. Alveoli vs Alveolus. The word alveoli mean small cavities or pits. In the lungs, they refer to the terminal dilatation of tiny air passages, and in the oral cavity, they are the sockets within the jawbone in which the roots of teeth are set. The respiratory system does this through ventilation, gas exchange between alveoli and capillaries, transportation of oxygen from the lungs to the cells; gas exchange between cells and capillaries and delivery of carbon dioxide from the cells to the lungs. The lower respiratory system conduct air to the air filled pockets (called alveoli) where gas exchange occurs between air and blood i.e. oxygen of the inhaled air from alveoli diffuses into the capillaries and carbon dioxide diffuses from the capillaries to the alveoli.
http://www.answers.com/Q/What_is_the_difference_between_alveoli_and_capillaries http://en.wikivet.net/Gas_Exchange_-_Anatomy_%26_Physiology http://en.wikivet.net/Gas_Exchange_-_Anatomy_%26_Physiology https://sg.answers.yahoo.com/question/index?qid=20080315174824AA5mLgq http://www.histology.leeds.ac.uk/respiratory/respiratory.php http://www.differencebetween.com/difference-between-alveoli-and-vs-alveolus/ http://websupport1.citytech.cuny.edu/Faculty/ibarjis/Teaching/Energy%20Metabolism/Lecture_5/Lecture_5_Respiratory_System.pdf
what is the link between alveoli and capillaries