Chiropractic Assistant Certification Practice Test

Blood is a complex fluid composed of several key components, each playing a vital role in its overall function. The primary elements that combine to make blood are:

1. **Plasma** - This is the liquid portion of blood, accounting for about 55% of total blood volume. Plasma is primarily composed of water, but it also contains proteins, hormones, nutrients, waste products, and electrolytes. Plasma serves to transport cells, nutrients, and waste products throughout the body.

2. **Red Blood Cells (RBC)** - Also known as erythrocytes, red blood cells are responsible for carrying oxygen from the lungs to the tissues and returning carbon dioxide from the tissues back to the lungs for exhalation. They constitute about 40-45% of the blood volume. The presence of hemoglobin allows RBCs to effectively bind oxygen and facilitate its transport.

3. **White Blood Cells (WBC)** - Known as leukocytes, these cells are crucial for the immune response. They help protect the body against infections and foreign invaders. While they make up a much smaller percentage of the blood volume compared to red blood cells, their diverse types and functions are essential for the body's defense mechanisms.

Together, these components—plasma