Water Balancers: To keep your water in balance, you should test the pool several times per week for chlorine and pH levels, and adjust as needed. Test total alkalinity every few weeks or if you have pH troubles, and test calcium hardness and cyanuric acid levels every month. pH Increaser: Granular Soda Ash.
The alveoli are surrounded by tiny blood vessels, called capillaries. The alveoli and capillaries both have very thin walls, which allow the oxygen to pass from the alveoli to the blood. The capillaries then connect to larger blood vessels, called veins, which bring the oxygenated blood from the lungs to the heart.
Summary Information: Pulmonary Capillaries. Pulmonary Capillaries: The pulmonary capillaries are tiny blood vessels that surround the alveoli of the lungs. The pulmonary capillaries receive deoxygenated blood from the small branches (arterioles) of the right pulmonary artery and left pulmonary artery and allow for the exchange of blood gasses with the alveoli. In this process, carbon dioxide is released from the blood and fresh oxygen is picked up.