What is the primary role of red blood cells?

The primary role of red blood cells is to transport oxygen around the body. These cells contain hemoglobin, a protein that binds to oxygen molecules in the lungs and carries them through the bloodstream to various tissues and organs. This process is essential for cellular respiration, which is how cells generate energy. Without adequate oxygen transport, tissues would not receive the energy they need to function effectively, which could lead to various health issues.

Red blood cells are specifically designed for this task, characterized by their biconcave shape that increases surface area for gas exchange. This form allows for efficient uptake of oxygen and optimal flow through the narrowest blood vessels. While supporting roles such as fighting infections and regulating body temperature are crucial in their own right, they fall outside the primary function of red blood cells. Other cell types, such as white blood cells, are responsible for immune responses, and the body regulates temperature through various physiological mechanisms, but these do not involve red blood cells directly.