Sunday, August 7, 2011

Blood: The definition, physical characteristics, functions

on 7:11 PM
Definition of Blood

Blood is a viscous liquid texture red color, another of the forms of connective tissue fills the heart and is going on inside the body through the blood vessels (veins and arteries and capillaries), and the volume of blood in the body 5-6 liters in an adult as a percentage of 8.7% of body weight, and quantity of blood in the circulatory system (heart and blood vessels) two thirds of the amount found in the whole body, while the remaining one third is stored in the liver, spleen and other parts of the body.


Physical properties of blood

 
Colour
Blood red color as a result of the presence of hemoglobin, a compound that gives blood the color and the color varies depending on the type of blood is bright red blood in the arteries as a result of the presence of oxygen and dark red blood in the veins due to the presence of carbon dioxide.

 
Viscosity
Of the viscosity of blood five times the viscosity of water, they are in men and women at 4.7 4.3 and the viscosity of blood depends mainly on the proteins in the plasma protein fibrinogen in particular.




 
Specific gravity


In men ranging between 1.057 - 1.067 in women between 1.051 - 1.061 and is dependent on the material dissolved in the plasma, such as protein and red blood cells.


The pH of the blood pH


Blood tends to reach the point of saluting the alkaline pH in the blood of the arteries, veins the blood of 7.4 and 7.35.



Blood components
Blood components
Blood consists of two important parts:
- Plasma (Plasma) and constitute 55% of the total volume of blood.
- Blood cells (Blood cells) and accounted for 45% of the total volume of blood.
First, plasma ((Plasma


Is a liquid part, which swim in blood cells, which are the color of pale yellow and the water is 90% of the total volume of plasma and this is important if we know that water is good solvent for many materials and molecules and therefore this makes it compromise effective for the transfer of material particles


Food dissolved in it, The remaining 10% consists of the following:
- Blood proteins (albumin, globulin, fibrinogen and thrombin).
- Materials such as sugars, fats, vitamins, enzymes and hormones.
- Directorial materials such as urea, creatinine and uric acid.
- Inorganic materials such as potassium, calcium, sodium, iron, chlorine, magnesium and other elements.


Can be obtained on the plasma centrifuge process after the addition of a rod of the clot, where blood cells are deposited.

II ((Blood cells

Blood cells are divided into three sections:


- White Blood Cells) WB.C. )


- Red Blood Cells) R.B.C).


- (Blood Platelets).


Functions of Blood


1. Respiratory function Respiratory


Is the transfer of oxygen (O2) to tissues of the lung and the expulsion of carbon dioxide (CO2) from the tissues to the lungs.


2. Nutritive


Is the transfer and distribution of food from the gastrointestinal tract to all the different tissues of the body.


3. Excretory


The blood to carry products of tissue metabolism to output devices such as: the transfer of carbon dioxide to the lungs and the transfer of urea to the kidneys.


4. Regulation of body temperature


Blood works to distribute heat to all parts of the body heat is transferred quickly from deep tissue to the tissue surface and vice versa, so it maintains the balance of the body (Body balance) also plays an important role in the organization of the degree of acidity (pH) in different organs.
5. Water balance


Blood plays a crucial role in water balance in the body, which keeps the amount of water present in the body through out the excess water by the kidneys and through the sweat glands in the body.


6. Transport and regulation of hormone


The organization of blood secretion of hormones from glands also maintains the parallel rate in the blood, as is also the transfer of these hormones from their places of production to places where they operate.
7. Defence
Has blood on the white blood cells (WBC), which produces antibodies (Antibodies) that defend the body against microbes and viruses attacking (ie, it has a key role in the body's immunity against various diseases).


8. Blood coagulation


Blood work on the prevention of bleeding (Bleeding) by the process of coagulation or blood clotting in the blood clotting factors work (Coagulation factors) that have an important role in the process to stop bleeding during injury and thus preserving the natural amount of blood in the body.


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