PRESENTATION OUTLINE
Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds with most elements.
Oxygen is important to every cell in your body. Without it, your cells can’t make energy, and their metabolism is less effective. You switch from a highly efficient energy-making machine to being 16 times less efficient and generating a lot of lactic acid (which is what builds up in your muscles and makes you sore). Without sufficient oxygen, we perform less efficiently.
Oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen at elevated partial pressures. It is also known as oxygen toxicity syndrome, oxygen intoxication, and oxygen poisoning. Historically, the central nervous system condition was called the Paul Bert effect, and the pulmonary condition the Lorrain Smith effect, after the researchers who pioneered its discovery and description in the late 19th century.
Hypoxia (also known as Hypoxiation or Anoxemia) is a condition in which the body or a region of the body is deprived of adequate oxygen supply. Hypoxia may be classified as either generalized, affecting the whole body, or local, affecting a region of the body. Although hypoxia is often a pathological condition, variations in arterial oxygen concentrations can be part of the normal physiology.
Selenium is a mineral found in the soil. Selenium naturally appears in water and some foods. While people only need a very small amount, selenium plays a key role in the metabolism.
Selenium has attracted attention because of its antioxidant properties. Antioxidants protect cells from damage. There is some evidence that selenium supplements may reduce the odds of prostate cancer. Selenium does not seem to affect the risk of colorectal or lung cancer. But beware: selenium also seems to increase the risk of non-melanoma skin cancer.
Because Americans have access to many foods rich in selenium, selenium deficiency is rare in the the U.S. Most adults consume far more than the recommended dietary allowance for selenium. However, people who suffer from certain diseases are at risk for selenium deficiency, which has serious side effects.
To avoid the dangers of too much selenium in your blood, the Institute of Medicine sets the tolerable upper intake level at 400 micrograms per day for anyone age 14 and older. In the United States, selenium toxicity is rare. However, those taking dietary supplements should take care to consume less than the recommended tolerable upper intake.
It may be obtained by eating nuts, nuts may obtain a good amount of selenium
