What is plasma?

Plasma is indeed the fluid portion of the blood and plays a crucial role in the circulatory system. It makes up about 55% of total blood volume and serves several vital functions. Plasma is composed mainly of water, but also contains proteins, hormones, nutrients, electrolytes, and waste products. Its primary roles include transporting these substances throughout the body, maintaining osmotic pressure to keep fluid balance, and providing the medium for various biochemical reactions.

The components of plasma are essential for the overall functioning of the body. For instance, proteins in plasma, such as albumin, help maintain blood volume and pressure, while clotting factors are vital for stopping bleeding. The presence of hormones allows for communication between different body systems, and dissolved nutrients provide energy for cellular activities.

In contrast, the solid portion of the blood consists of red blood cells, white blood cells, and platelets, which have different functions related to oxygen transport, immune response, and blood clotting, respectively. Understanding the distinction between plasma and the cellular components of blood is fundamental in the field of medicine, especially for combat medics, who need to quickly assess and address various blood-related issues in trauma situations.