Question

Name a respiratory pigment present in the human blood.

Answer 1

Hint: Respiratory pigment is classified into four types: hemoglobin, hemocyanin, erythrocruorin–chlorocruorin, and hemerythrin. The most common respiratory pigment is heme-containing globin, which is found in at least 9 different animal phyla.

Complete answer:
Blood is a constantly circulating fluid that provides nutrition, oxygen, and waste removal to the body. Blood is mostly liquid, but it contains many cells and proteins, making it "thicker" than pure water. The average person's blood volume is 5 liters (more than a gallon).
About half of the blood's content is made up of a liquid called plasma. Proteins in plasma aid in blood clotting, transport substances through the blood, and perform other functions. Glucose and other dissolved nutrients are also present in blood plasma.
Hemoglobin is the respiratory pigment of invertebrates. Hemoglobin is made up of two pairs of polypeptide chains and has a molecular weight of approximately 68,000. Each chain carries a heme group containing iron. Four oxygen molecules can be transported by the hemoglobin molecule.
Hemoglobin is the protein that gives blood its red color. It is made up of four protein chains, two alpha and two betas, each with a ring-like heme group containing an iron atom. Oxygen binds to these iron atoms reversibly and is transported through the blood.

Thus, Hemoglobin is a respiratory pigment present in the human blood.

Note:
In general, low hemoglobin levels that require treatment are caused by three factors: decreased red blood cell production (for example, altered bone marrow hemoglobin production, iron deficiency), increased red blood cell destruction (for example, liver disease), and blood loss (for example, trauma from a fall). Anemia is caused by low hemoglobin levels, which causes symptoms such as fatigue and trouble breathing.