90%
Water takes up more than half of the body weight.
This is because Carbon dioxide is about 25 times more soluble in water than oxygen at body temperature. Carbon dioxide is more soluble because a chemical reaction takes place with water when it dissolves forming Carbonic acid when combined with water. There is no chemical reaction taking place when oxygen dissolves in water.
Decaying matter is natural in a body of water, it is natural in any environment. However a large amount of decaying matter in a body of water could lead to a dead zone. This is because if there is a disruption in the food web of that body of water it could kill many organisms. If many animals die, the decaying takes more oxygen out of the water than can be replaced and you are left with a body of water that has no oxygen called a dead zone.
In air breathing animals, the lings are the organ system that takes in air and extracts oxygen for distribution through the circulatory system. In water breathing animals, the gills perform this function. Those smaller animals that have neither lungs nor gills usually have a system for direct absorption of oxygen from the air, or water.
Water does not directly provide a person with more oxygen at high altitude. However, staying hydrated can help maintain optimal oxygen levels in the body by supporting proper circulation and preventing dehydration, which in turn can help mitigate some of the negative effects of high altitude.
No. There is more oxygen in deeper water.
You yawn when you are sleepy because that is when you take in the least oxygen. Your body takes in more oxygen when you are yawning, which explains the reason to why you take in air when you yawn.
Freshwater has more oxygen than salt water but oxygen is more solublein fresh water.
It generally takes slightly more oxygen to breathe when you are hot, as your body tries to regulate its temperature by increasing your breathing rate. This helps dissipate heat and maintain thermoregulation.
Oxygen is more soluble in fresh water than it is in sea water, therefore there is more dissolved oxygen in river water than sea water.
Taking a deep breath while in water will make a person more buoyant, causing them to float with more of their body out of the water. This is because the volume of air in the lungs increases, creating more lift.
When oxygen sensors in the brainstem are triggered by low levels of oxygen in the bloodstream, yawning tends to ensue. Yawning is the body's way of increasing oxygen intake, involuntarily, naturally.