Commonly called breathing which is air moved into and out of the lungs. During inspiration and expiration so the gases there are continually changed and refreshed. External respiration. Oxygen diffuses from the lungs to the blood and carbon dioxide diffuses from the blood to the lungs. exchange between external environment (alveoli) & blood*. Transport of respiratory gases. oxygen is transported from the lungs to the tissue cells to the lungs. **THE cardiovascular system accomplishes this transport using blood as the transporting fluid. Internal respiration. oxygen diffuses from the blood to tissue cells, and carbon dioxide diffuses from tissue cells to blood.
While strong stimulants (such as cocaine) can cause seizures, the milder stimulant effects of nicotine and caffeine don't seem to impact on seizure frequency (except with extreme excess use).
unless that level is maintained the body will begin to go through withdrawal for tobacco users trying to quit symptoms of withdrawal from nicotine are unpleasant and stressful but only temporary most withdrawal symptoms peak 48 hours after you quit and are completely gone in six months mental and emotional symptoms