I believe that it relates to or involves free oxygen, if it is used in exercise- aerobic practices help improve the the efficiency of the body's cardiovascular system with absorbing and transporting oxygen.
Hope this helps
D. Headaches and elevated blood pressure.
Arthritis is caused by your immune system attacking your joints (rheumatoid) or overuse of the joints (osteo.) Carpal tunnel is caused by overuse of the hands. Hearing and vision loss can be caused by quite a few things, but old age is a common cause. Dental cavities are a combination of not/incorrectly brushing your teeth and other factors like eating too much sugar. Bone loss could be a calcium deficiency.
For some reason I have a little bit of doubt that this is related to your schoolwork, however this is important to learn to not do so by mistake. This would take a few minutes of inhaling fumes and is a very painful way to die. Even if it doesn't kill you, exposure can lead to brain damage and chemical burns. 5-10 minutes of non ventilated inhaling.
