What are the primary components of blood?

The primary components of blood include red blood cells, white blood cells, and plasma. Red blood cells are responsible for carrying oxygen from the lungs to the body's tissues and carbon dioxide back to the lungs for exhalation. White blood cells play a critical role in the immune system, helping the body fight off infections and other diseases. Plasma is the liquid component of blood that facilitates the transport of nutrients, hormones, and waste products throughout the body.

This core understanding of blood composition is fundamental in biomedicine, as it highlights the different functions of blood components and their importance to overall health. While other options mention various substances related to blood or bodily functions, they do not encompass the essential makeup of blood as effectively as the correct choice.