The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream. The pulmonary veins bring oxygen-rich blood to the left atrium.
Lung cancer starts when abnormal cells grow out of control in the lung. They can invade nearby tissues and form tumours. Lung cancer can start anywhere in the lungs and affect any part of the respiratory system. The cancer cells can spread, or metastasize, to the lymph nodes and other parts of the body.
Electronic cigarettes, or e-cigarettes, put nicotine into your lungs and bloodstream. And they do it without the smoke and tar of a regular cigarette. But other harmful things can get into your body when you vape. ... Many chemicals that cause cancer are in this vapor.Apr 25, 2017