Correct Option
The correct option isActing as the fluid medium for suspending blood cells and transporting nutrients
Explanation
Blood is a specialized connective tissue consisting of a fluid matrix called plasma and formed elements (Red Blood Cells, White Blood Cells, and Platelets). Plasma constitutes approximately 55% of the total blood volume and is essential for maintaining blood fluidity and transport functions.
Option Analysis
- Binding and transporting oxygen molecules is Incorrect: The binding and transport of oxygen molecules is the primary function of hemoglobin found within Red Blood Cells (Erythrocytes), not the plasma.
- Acting as the fluid medium for suspending blood cells and transporting nutrients is Correct: Plasma is a straw-colored, viscous fluid that acts as the extracellular matrix. It serves as the medium for suspending blood cells and transports dissolved substances such as nutrients (glucose, amino acids), hormones, proteins (fibrinogen, globulins, albumins), and metabolic wastes.
- Forming the structural lining of blood vessels is Incorrect: The structural lining of blood vessels is composed of endothelial cells (simple squamous epithelium), not plasma.
- Filtering nitrogenous wastes in the kidneys is Incorrect: While plasma transports nitrogenous wastes (like urea) to the excretory organs, the actual process of filtering these wastes occurs in the kidneys (specifically the nephrons).
Key Takeaway
Plasma is the liquid component of blood responsible for suspending blood cells and transporting nutrients, hormones, clotting factors, and waste products throughout the body.