AEMCA Practice Exam 2025 - Free Practice Questions and Study Guide for Advanced Emergency Medical Care Assistant Certification.

Formed elements within the blood refer specifically to the cellular components that make up a significant portion of blood volume. These components include erythrocytes, commonly known as red blood cells, which are responsible for transporting oxygen throughout the body. Additionally, thrombocytes, or platelets, play a crucial role in blood clotting and wound healing.

The presence of these two types of cells as formed elements is essential for maintaining vital physiological functions. Erythrocytes facilitate gas exchange, while thrombocytes are integral to hemostasis, preventing excessive bleeding following vascular injury.

In contrast, cholesterol and glucose are substances carried in the plasma, not cellular components, while hormones and enzymes can be found in the bloodstream but are also not categorized as formed elements. The term "formed proteins" is vague and does not specifically describe the cellular components that constitute formed elements, thus solidifying the distinction that erythrocytes and thrombocytes are the accurate examples of formed elements in blood.