MCQ Detailed View

Blood is a vital fluid that circulates throughout the human body, delivering oxygen and nutrients to tissues and removing waste products. It is composed of different components, and the fluid part of blood is called plasma. Plasma makes up about 55% of total blood volume and serves as the transport medium for various substances in the body.

Plasma is a pale yellow, watery liquid that consists of about 90–92% water and 8–10% dissolved substances. These substances include proteins, salts, glucose, hormones, enzymes, and waste products like urea and carbon dioxide. The presence of water in plasma allows nutrients and gases to dissolve easily, making it possible for them to travel efficiently throughout the body.

Plasma also contains important proteins such as albumin, globulins, and fibrinogen. These proteins help in maintaining blood pressure, fighting infections through antibodies, and aiding blood clotting when injuries occur. Without plasma, blood cells would not have a proper medium to move freely inside blood vessels.

Other components of blood, such as red blood cells (RBCs), white blood cells (WBCs), and platelets, are suspended within the plasma. RBCs carry oxygen, WBCs fight infections, and platelets help in clotting. However, these are solid cellular elements, whereas plasma is the liquid part that enables circulation and transport.

Plasma plays a critical role in maintaining body temperature, balancing water levels, and carrying hormones and nutrients to different organs. It also helps remove waste products by transporting them to the kidneys, lungs, or liver for excretion.

Thus, the fluid part of blood is called plasma, and it is essential for proper functioning of the circulatory system, making it one of the most important components of human biology.