Washington Esthetician State Board Practice Exam

What is the primary function of plasma in the blood?

1. Supplies oxygen to body cells

2. Takes carbon dioxide away from body cells

3. Contributes to blood clotting

4. Regulates body temperature

The correct answer is: Takes carbon dioxide away from body cells

The primary function of plasma in the blood encompasses several critical roles, one of which is the transportation of various substances throughout the body. Plasma serves as the liquid component of blood and is vital for maintaining homeostasis. It acts as a medium for transporting nutrients, hormones, proteins, and waste products. While option B mentions the transportation of carbon dioxide away from body cells, this specific role is primarily attributed to red blood cells, which contain hemoglobin. Plasma does help in this process, as it carries dissolved gases, but it is not the primary function of plasma itself. The correct focus for understanding plasma is that it assists in regulating various functions, including the distribution of electrolytes, maintain blood pressure and volume, and contributes to maintaining pH balance. Among these functions, its role in contributing to blood clotting is particularly significant. Plasma contains clotting factors necessary for coagulation, a critical process for preventing excessive bleeding when injuries occur. Additionally, plasma proteins play a crucial part in immune responses and maintaining osmotic pressure. In summary, while plasma does contribute to the movement of carbon dioxide, its primary functions are much broader, encompassing various roles critical for the proper functioning of the body, with significant emphasis on blood clotting and the transport of substances.