The respiratory system can be damaged from smoke inhalation and tar buildup from the chemicals used in tobacco, which can also harm the heart and blood vessels. Two conditions that can be caused from smoking are Heart Disease and Lung Cancer.
<span>the ability of the heart and lungs to supply oxygen to the body</span>
Answer:
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.
