The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.

Photosynthesis is the major source of atmospheric free oxygen which produces sugars and free oxygen from carbon dioxide and water. Plant life of the land areas as well as the phytoplankton of the oceans are the organisms that photosynthesize releasing oxygen in the atmosphere.

Oxygen in the form of the oxygen molecule (O2), produced by plants and vital for animals, is abundant in Earth’s atmosphere and oceans. But at some point, Earth underwent what scientists call the Great Oxidation Event or GOE for short, as ocean microbes evolved to produce O2 via photosynthesis.

Answer Expert Verified cyanobacteria. These organisms produce food by using energy from the sun; they are photosynthetic organisms. Over millions of years these organisms used CO2 in the air for photosynthesis and released oxygen as a byproduct.

troposphere

Scientists estimate that 50-80% of the oxygen production on Earth comes from the ocean. The majority of this production is from oceanic plankton — drifting plants, algae, and some bacteria that can photosynthesize.

plankton

Answer Expert Verified Oxygen is important to our body because it is one of the most important elements required to sustain life. Our health will suffer and/or we die without it. Oxygen is part of our immune system it helps kill bacteria and fuels the cells that make up our body’s defenses against viruses.

Our body needs oxygen to obtain energy to fuel all our living processes. Carbon dioxide is a waste product of that process. The respiratory system, with its conduction and respiratory zones, brings air from the environment to the lungs and facilitates gas exchange both in the lungs and within the cells.

Humans need oxygen to live, but not as much as you might think. The minimum oxygen concentration in the air required for human breathing is 19.5 percent. The human body takes the oxygen breathed in from the lungs and transports it to the other parts of the body via the body’s red blood cells.

Every cell in the body needs oxygen to complete the metabolic processes that give life. Oxygen provides the fuel needed by the brain to function properly, and it helps the body fight off infection by boosting the immune system.

Project summary. Low oxygen levels in the tissues (hypoxia) can suppress some aspects of the immune response, while at the same time it can induce and accentuate other important functions of the immune cells.

Time is very important when an unconscious person is not breathing. Permanent brain damage begins after only 4 minutes without oxygen, and death can occur as soon as 4 to 6 minutes later.

Between 30-180 seconds of oxygen deprivation, you may lose consciousness. At the one-minute mark, brain cells begin dying. At three minutes, neurons suffer more extensive damage, and lasting brain damage becomes more likely. At five minutes, death becomes imminent.

Foods That Help Increase Blood Flow Circulation

1. Boost Circulation. Blood is the fluid that supplies oxygen and nutrients to your heart, lungs, organs, muscles, and other systems.
2. Cayenne Pepper. Cayenne red pepper is an orange-red spice that can help boost blood flow.
3. Beets.
4. Berries.
5. Fatty Fish.
6. Pomegranates.
7. Garlic.
8. Walnuts.

A decrease in oxygen saturation and increases in pulse rate and heart rate variability were found to be associated with ambient concentration of fine particles. A heart rate acceleration may well result either from impairment of autonomic nervous cardiac control or in response to hypoxia.