Plasma is a yellowish liquid component of blood that holds the blood cells in whole blood in suspension. It is the liquid part of the blood that carries cells and proteins throughout the body. It makes up about 55% of the body's total blood volume. It is the intravascular fluid part of extracellular fluid.

Blood consists of Plasma as the fluid medium.

Explanation:
Blood is a complex tissue that circulates throughout the body, carrying oxygen, nutrients, hormones, and waste products to and from various organs and tissues. It is composed of different components, including red blood cells, white blood cells, platelets, and plasma.

Plasma is the yellowish fluid portion of blood that makes up about 55% of the total blood volume. It is a clear, straw-colored liquid that acts as a medium for carrying blood cells, nutrients, hormones, and waste products. Plasma is mainly composed of water (approximately 92%), along with various proteins, electrolytes, hormones, enzymes, gases, and waste products.

Key Points:
- Blood consists of various components, including red blood cells, white blood cells, platelets, and plasma.
- Plasma is the fluid medium in which blood cells and other substances are suspended.
- Plasma makes up about 55% of the total blood volume.
- It is composed of water, proteins, electrolytes, hormones, enzymes, gases, and waste products.
- Plasma plays a crucial role in maintaining the pH balance, transporting nutrients and waste products, regulating body temperature, and carrying antibodies and other immune system components.

In conclusion, blood consists of plasma as the fluid medium. Plasma is a vital component of blood that carries various substances throughout the body, ensuring the proper functioning of organs and tissues.