Functions of Red, White, Plasma and Blood Pieces of Blood

Blood is a red liquid that circulates in our blood vessels. The main function of blood is as a body transportation system that circulates oxygen and food substances, but also has a major role in the body’s defense system against infection. In every drop of blood, it consists of several components which are broadly divided into two, namely cell and fluid components. Nearly half the blood volume consists of blood cells, which include red blood cells, white blood cells, and platelets. The rest is a liquid called blood plasma. Nearly 92% of plasma is water while the rest consists of enzymes, hormones, antibodies, nutrients, gases, salts, proteins and metabolites of various types.

What is the function of blood? What about the function of each component of the blood?

Functions of Blood in General


Blood is the main means of transportation in the body that is responsible for transporting essential ingredients, molecules, and nutrients to and from the cells that make up our body. In this case, the main function of blood is to carry oxygen from the lungs to all body cells and then after oxygen is used carbon dioxide is formed which will also be carried by the blood to the lungs to be exchanged again with oxygen, and so on. Blood is also responsible for collecting metabolic waste from the upper and lower body and bringing it to the kidneys to be excreted or excreted in urine. The next function of blood is to provide nutrients and glucose obtained from the digestive system organs to other parts of the body first to the liver and then spread throughout the body. In addition to the above tasks, blood also functions to carry out the transport of hormones produced by the glands of the endocrine system so that these hormones reach the target organs to carry out their functions.


Blood performs an important function in protecting the body from the threat of infection by microorganisms that cause disease. White blood cells found in the blood are responsible for maintaining body organs by producing antibodies and proteins that can fight and kill germs that can cause serious damage to body cells. Platelets or platelets protect the body from blood loss through blood clotting activities when trauma or bleeding injury occurs.


Blood also has a regulating function for many factors in the body. For example, monitor body temperature and maintain it at a level that can be tolerated by the body. Blood is also responsible for controlling the concentration of hydrogen ions in the body, also known as pH balance. The function of blood also plays an important role in regulating the fluid and electrolyte balance needed by every cell of the body. Another task that is done by blood is controlling blood pressure so that it is within the normal range.

The function of Blood Components

The function of Blood Plasma

Plasma is the most abundant component in our blood. It has a number of functions which include carrying glucose or blood sugar which is the main nutrient needed by each cell to produce energy. Besides that, it also carries other nutrients including vitamins, cholesterol, amino acids, triglycerides, and fatty acids. All nutrients are carried by blood plasma to and from every cell in the body. Plasma is also responsible for transporting cortisol and the thyroxine hormone, which attaches to plasma proteins and is then carried to all parts of the body. Homeostasis and management of cell functions are also tasks carried out by plasma with the help of inorganic ions. Wound healing and stopping bleeding through the freezing process is another function of blood plasma that is possible because of the presence of clotting agents in it. Plasma even plays a role in helping the body fight germs and infections thanks to an antibody called gammaglobulin in it. Read more here: 10 Functions of Blood Plasma that are Important for the Body

The function of White Blood Cells

Infections that threaten and potentially damage the body will be handled by white blood cells by recognizing them first and then destroying the microorganisms concerned. This is the main function of white blood cells as the body’s defense. white blood cells are also known as leukocytes are formed in stem cells in the bone marrow and begin to circulate in the body through the bloodstream and through lymph vessels.

The function of Red Blood Cells

The main function of red blood cells is to carry oxygen to all body cells along with pumping blood carried out by the heart. Red blood cells have high speed when flowing through veins and arteries. Veins have walls that are relatively thinner compared to arteries because blood pressure is not too intense compared to arteries. Areri brings oxygen-rich blood while veins carry blood rich in carbon dioxide (CO2). The condition of a lack of red blood is called anemia

Platelet Function (Blood Pieces)

Platelets or platelets are the smallest and lightest component of blood. Because of their small size, they usually travel near the walls of blood vessels that carry them. The walls of blood vessels consisting of special cells called endothelium prevent the attachment of platelets to the walls of blood vessels. However, in the case of injury, when the endothelial cell layer is damaged and blood begins to flow out of the blood vessel (bleeding), the platelets react immediately by attaching to damaged blood vessels and forming fibers and a freezing layer occurs so that bleeding stops. That is why platelet deficiency is very dangerous, for example in dengue fever. Further, please read: How to Increase the Thrombocyte so, hopefully, it is useful.