Which of the following components are present in solid blood portions?

The correct answer indicates that red blood cells (RBCs), white blood cells (WBCs), and platelets (PLTs) are all components found in the solid portions of blood. This solid portion of blood is often referred to as the formed elements.

RBCs are responsible for transporting oxygen from the lungs to body tissues and returning carbon dioxide to the lungs for exhalation. WBCs play a crucial role in the immune response, helping to defend the body against infection and foreign substances. PLTs, or platelets, are essential for blood clotting, as they help to prevent bleeding by promoting the clotting process when any injury occurs.

In contrast, plasma is the liquid portion of blood that carries these formed elements along with nutrients, hormones, and waste products. The presence of only one type of blood cell, such as just WBCs or only platelets, does not represent the complete range of solid components found in blood, making those options incomplete. Thus, the inclusion of all three types of formed elements in the correct answer is essential for accurately depicting the solid constituents of blood.