Question

Is blood always red?

Answer 1

Blood is a loose connective tissue that can be found all over the body. It has a red colour and aids in oxygen transport throughout the body.Plasma, platelets, and blood cells make up blood, which is one of the most vital components of life.
Compounds containing Iron-based compounds tend to be red in colour.

Complete answer:
The colour of blood in the human body is red, regardless of how much oxygen it contains, however the shade of red varies. The colour red is determined by the amount of oxygen in the blood. Blood is brilliant crimson when it leaves the heart and becomes oxygen-rich. There is less oxygen in the blood as it returns to the heart.
The protein haemoglobin is responsible for the red colour of blood. Heme is a red-colored molecule that makes up haemoglobin. Heme is extremely helpful for transporting oxygen throughout the body. Men's haemoglobin levels range from $135$ to $170$, while women's levels range from $120$ to $160$.
Because of the interaction between iron and oxygen, blood cells are red. (It appears red because of how light is reflected by the chemical interactions between the iron and the oxygen).
The function of haemoglobin in blood is as follows:
1. They are important for the human body because they aid in the transport of oxygen from the lungs to other tissues of the body.
2. It also aids in the transport of carbon dioxide from the tissues back to the lungs.
3. Deficiency of haemoglobin can lead to anaemia.

Note:
The red colour of blood is commonly misunderstood to be owing to haemoglobin iron. The fact that iron oxides (rust) have a reddish tint is most likely the source of this fallacy. In truth, the porphyrin ring to which the iron is attached, not the iron itself, gives haemoglobin its scarlet colour.
Functions of blood-
1. It assists in the delivery of oxygen to the cells, as well as hormones and nutrients to various tissues and organs.
2. It also aids in body temperature control.