Body Fluids Composition And Function Of Blood Pdf

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body fluids composition and function of blood pdf

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When a sample of blood is spun in a centrifuge , the cells and cell fragments are separated from the liquid intercellular matrix. Because the formed elements are heavier than the liquid matrix, they are packed in the bottom of the tube by the centrifugal force. The light yellow colored liquid on the top is the plasma , which accounts for about 55 percent of the blood volume and red blood cells is called the hematocrit ,or packed cell volume PCV.

Composition of the Blood

Blood is a body fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. In vertebrates , it is composed of blood cells suspended in blood plasma. Albumin is the main protein in plasma, and it functions to regulate the colloidal osmotic pressure of blood. The blood cells are mainly red blood cells also called RBCs or erythrocytes , white blood cells also called WBCs or leukocytes and platelets also called thrombocytes. The most abundant cells in vertebrate blood are red blood cells. These contain hemoglobin , an iron-containing protein, which facilitates oxygen transport by reversibly binding to this respiratory gas and greatly increasing its solubility in blood. In contrast, carbon dioxide is mostly transported extracellularly as bicarbonate ion transported in plasma.

Blood , fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products. Technically, blood is a transport liquid pumped by the heart or an equivalent structure to all parts of the body, after which it is returned to the heart to repeat the process. Blood is both a tissue and a fluid. It is a tissue because it is a collection of similar specialized cells that serve particular functions. These cells are suspended in a liquid matrix plasma , which makes the blood a fluid.

The fluid compartments of the body

The liquid component of the blood in which the following blood cells are suspended:. Red blood cells erythrocytes. These carry oxygen from the lungs to the rest of the body. White blood cells leukocytes. These help fight infections and aid in the immune process.

Find GPs in Australia. The formed elements are so named because they are enclosed in a plasma membrane and have a definite structure and shape. All formed elements are cells except for the platelets, which are tiny fragments of bone marrow cells. Leukocytes are further classified into two subcategories called granulocytes which consist of neutrophils, eosinophils and basophils; and agranulocytes which consist of lymphocytes and monocytes. The formed elements can be separated from plasma by centrifuge, where a blood sample is spun for a few minutes in a tube to separate its components according to their densities. This volume is known as the haematocrit. WBCs and platelets form a narrow cream-coloured coat known as the buffy coat immediately above the RBCs.

The composition of tissue fluid depends upon the exchanges between the cells in the biological tissue and the blood. This means that fluid composition varies between body compartments. The cytosol or intracellular fluid consists mostly of water, dissolved ions, small molecules, and large, water-soluble molecules such as proteins. This mixture of small molecules is extraordinarily complex, as the variety of enzymes that are involved in cellular metabolism is immense. These enzymes are involved in the biochemical processes that sustain cells and activate or deactivate toxins.

Blood function and composition

Clinical Management of Electrolyte Disorders pp Cite as. Body fluid consists of an aqueous solution of salts, proteins and carbohydrates. Some of this solution is within cell membranes intracellular fluid and some is outside the membranes extracellular fluid.

Components of Blood

A significant percentage of the human body is water, which includes intracellular and extracellular fluids. In physiology, body water is the water content of the human body.

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See also Overview of Blood. Plasma is the liquid component of blood, in which the red blood cells, white blood cells, and platelets are suspended. It constitutes more than half of the blood's volume and consists mostly of water that contains dissolved salts electrolytes and proteins. The major protein in plasma is albumin. Albumin helps keep fluid from leaking out of blood vessels and into tissues, and albumin binds to and carries substances such as hormones and certain drugs. Other proteins in plasma include antibodies immunoglobulins , which actively defend the body against viruses, bacteria, fungi, and cancer cells, and clotting factors , which control bleeding.

The heart pumps blood through a vast network of arteries and veins. Blood is a living fluid. It transports oxygen and other essential substances throughout the body, fights sickness, and performs other vital functions. Below are 8 important facts about blood. Because of these living cells suspended in the plasma, blood is considered a fluid connective tissue not a fluid. It is the only fluid tissue in the body. Blood absorbs oxygen from air in the lungs.


The exact chemical composition of body fluid is highly variable. Physiologic blood plasma osmolarity is approximately mOsmoles/L. Less.


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  1. Renee86 10.05.2021 at 09:47

    Important Body Fluids? What Are the Functions and Composition of. Blood? How Does Blood Serve as.

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    The Composition and Function of Body. Fluids (Third Edition) by Shirley R Burke. pp blood volume, the blood pressure, the velocity of blood flow and some.

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