Human blood is typically red, but under specific circumstances, it can change to blue.
For instance, the condition sulfhemoglobinemia makes blood appear green or dark blue. Exposure to significant levels of chemicals containing sulphur is what causes this.
The body receives nutrition, oxygen, and waste elimination through the blood, which is a fluid that circulates continuously.
Blood is mostly a liquid, but it also contains many suspended cells and proteins, making it "thicker" than pure water.