The hemoglobin is soluble in:

🧠 Explanation:

Hemoglobin is soluble in water and in dilute salt solutions, which allows it to circulate freely in the bloodstream within red blood cells. This solubility is essential for its primary function — transporting oxygen from the lungs to tissues and carrying carbon dioxide back to the lungs for exhalation. The protein’s structure, made up of globin chains and iron-containing heme groups, enables it to bind oxygen efficiently while remaining dissolved in the plasma environment of the cell. Its water solubility also facilitates smooth biochemical interactions, maintaining proper blood viscosity and ensuring that oxygen delivery remains consistent and efficient throughout the body.