The lungs expand to take in more air while you breathe heavy and breathing more then normal day-to-day things like cleaning the house washing the dashes etc.
blood and oxygen
the lungs (or if muscle workout, the limb in question)
The pressure in the pulmonary artery increases during exercise if the cardiac output increases.
During aerobics exercise, lungs take in air and transfer oxygen to the blood, which is then pumped by the heart to the muscles that need it.
This type of exercise, during which the body's oxygen need exceeds the lungs' ability to replenish it is called anaerobic exercise -- literally, 'without air.' Exertion of longer duration, during which the body is able to sustain the energy output (and the lungs have the capacity to provide the necessary oxygen for a longer period of time) is known as aerobic exercise.
Because your body requires more oxygen and to get this it needs more air to pass through the lungs.
During exercise, lactic acid builds up in the muscles, leading to muscle aches. The lungs produce carbon dioxide, as they do at rest, and sweat is also produced by the body.
Blood vessels, the heart, and the lungs are significantly strengthened by cardiovascular exercise.
During CPR the lungs and heart are stimulated.
When you do cardio respiratory exercises, you enable more blod flow and you exercise the heart. The breathing in respiratory exercises also cleanse the breathe and helps you have more oxygen in the body.
Healthy lungs breathe between 6 (at rest) and 150 (during exercise) liters of air per minute.
No. Smoking is bad for you, regardless of what you do during or afterwards. I don't see much reason for exercising to reduce the effects of smoking. Smoking is bad for your lungs and it will mean that your exercise capability and fitness will decrease.