If we know how much we give, and later measure the concentration of inulin in the plasma we can calculate the volume of the extracellular space. If we give inulin to a person inulin will distribute itself into the whole extracellular fluid space. We can measure the sizes of different fluid compartments of a person by administering certain compounds intravenously. 40% of the body’s weight is intracellular water and 20% of the body’s weight is extracellular water. 60% of the body’s weight is water (total body water). It’s easy to remember how much each fluid volume weighs with the 60 – 40 – 20 rule. These volumes vary from person to person, but they’re approximately the same in everyone who have average bodies. Transcellular fluid (not important right now).Plasma fluid/intravasal fluid (fluid inside the blood vessels).Interstitial fluid (fluid in the interstitial space, the space that is between cells in a tissue).Extracellular fluid compartment (fluid outside cells).Intracellular fluid compartment (fluid inside cells).These compartments are best illustrated as a tree: That fluid is divided into two major compartments, the intracellular compartment, which includes all the water inside the cells, and the extracellular compartment, which includes all the water outside the cells. Cell typeĪ good way to remember the order of white blood cells in decreasing order from most abundant to least abundant is the pneumonic n ever l et m onkeys e at b ananas. You should know which cells are present in the blood and in what number. The cellular elements comprise 45% of the total blood volume. The blood can be divided into two parts: The plasma and the cellular elements. Transports endocrine hormones around, allowing communication between cells.Protection against pathogens, because it carries the white blood cells and other components of the immune system around.Regulate pH, because the plasma contains acid-base buffers.Regulate body temperature by altering blood flow through the skin.Transports important molecules to and from cells.If a person has too little blood volume, he has hypovolaemia, and if he has too much he has hypervolaemia. That’s because the blood contains many cells and proteins that contribute to the blood volume. The volume of the plasma is around 3 litres in an average person, but the average blood volume is 4-6 litres.
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