10-16 October 2012 (week 13)

Tittle of Activity

-Project research-what is the blood volume

-make is as literature review.


Objectives 
-To know about the blood volume .



Content /Procedure

WHAT IS THE BLOOD VOLUME 

 Blood volume is a measurement of the volume, or amount of space, that the blood takes up in a given person. This includes both red blood cells and plasma, it is not limited to one particular part of blood. Maintaining a normal volume of blood is very important as it carries and essential nutrients throughout the body. If a person loses too much blood because of bleeding wound or because of inadequate blood cell synthesis, dangerously low blood pressure can result and may cause vital organs to receive inadequate amounts of oxygen and nutrients.

 There are many different factors that affect blood volume from person to person. Female, on average, have less blood than males do, and the bodies of children tend to contain less than those of grown men or women. Most people have roughly 102 gallons (407 litres) of blood in their bodies. Blood makes up approximately 1/11 of human body weight. People who live at high altitudes tend to have a higher volume because there is less oxygen in the air, the extra blood is needed to carry additional oxygen 

.throughout the body

  

Blood volume is regulated by the excretory system, particularly by the action of the kidneys. When the amount of blood in the body increases to a certain point, blood pressure increase and, through mechanism involving nerves and hormones, a signal is sent to the kidneys. The kidneys then reabsorb less fluid, causing more water and other substances necessary to blood production to be lost through urination, decreasing the volume of blood. The opposite happens when there is too little blood, the kidneys reabsorb more water and other substances necessary for blood, causing less to be lost through urination. Through this and other mechanism, blood pressure and volume are regulated and maintained at healthy levels

The volume of blood in a pregnant woman increases drastically over the normal amount of blood in the body, and it can actually increase by 25 to 50% because the developing fetus and the women is enlarged reproductive organs both needs more blood. To supply this blood, the heart must beat harder and faster tan usua and some blood vessel grow larger. In most cases, the volume of the plasma component of blood increases more than the volume of red blood vessel cells. This can lead to cases of 

anemia in pregnant woman, which tends to cause dizziness and fatigue.

 

Result &analysis 

 . To get the knowledge about blood volume with 

.To know the volume of blood in pregnant women