(20 14? Meilie district simulation) PM2.5 (fine particles), that is, pollutant particles with a diameter less than 2.5 microns, is an important source of haze weather.

The respiratory system consists of respiratory tract and lungs. After entering the lungs, PM2.5 particles can enter the blood through the alveolar wall and capillary wall, and first reach the [1] left atrium of the heart through pulmonary circulation. (2) The formation of urine includes the filtration of the inner wall of glomerulus and renal capsule and the reabsorption of renal tubules. Blood enters the kidney from blood vessel 8, and heavy metals in PM2.5 are easy to cause nephrotoxicity. Thereby affecting glomerular filtration and renal tubular reabsorption. (3) Blood circulation is divided into pulmonary circulation, and blood changes from arterial blood to venous blood through systemic circulation, from B to A in the figure. (4) Air quality is very important to human health, and controlling pollution discharge is the fundamental measure to improve air quality. To prevent and control air pollution, we can start from the following aspects, take various measures to reduce the generation of pollutants, and adopt various professional technologies. Improve environmental supervision and strengthen law enforcement. So the answer is: (1) respiratory tract; Capillary; Left atrium (2) filtration; Reabsorption

(3) arteries; Vein (4) Take various measures to reduce the generation of pollutants and adopt various professional technologies to control the discharge of pollutants; Improve environmental supervision and strengthen law enforcement.