Blood Pressure is extremely variable. What is normal blood pressure is not clear. Young adults in good health may have a systolic, or contracting phase, pressure of between 100 and 140 millimeters of mercury; older adults may have a systolic blood pressure of from 120 to 180. Diastolic, or resting phase, pressure is usually below 95 millimeters of mercury in a healthy individual of any age. Thus, a good average blood pressure for a college student might be 120/80.
Generally speaking, a continued diastolic blood pressure reading of over 95 is considered abnormal of people of any age. Elevated systolic blood pressure readings are usually of less concern, and in fact may increase with age as the blood vessels become less elastic. It is normal for a person's blood pressure reading to vary from time to time. They may decrease when the individual is resting and increase during excitement, anger, or strenous physical activity, when the heart pumps more vigorously.
The Coronary Arteries
The heart itself is a muscle, and like all other parts of the body it must have a blood supply to deliver oxygen and remove wastes. Surprisingly, very little of the thousand of gallons of blood circulating through the heart each day actually feeds the heart directly from within the heart chamber. Instead, the heart is nourished through the coronary arteries, two small blood vessel that arise from the aorta and encircle the heart, supplying blood to the heart muscle through numerous branches. Approximately one-eight of an inch in diameter (aboout the width of a drinking straw), these arteries are critical. If they become blocked, a portion of the heart's cells die. This is what happens when a person suffer a heart attack.
Thursday, July 9, 2009
Monday, June 29, 2009
Blood Donor
As clever as human, still don’t able to build a blood. If a patient lessen of blood or anemia on our body we need blood transfusion, this blood is get from many volunteer who give their blood. This blood then will process first using a process called as fractionation. This blood volunteer more found in developed countries, in under developing country and poor country we difficult to find a blood volunteer, why? This is because of rare of established supplies are limited and donor just give blood when the family or friends need a transfusion.
Blood donation also must fulfill the certain condition, should no contaminated with certain diseases like HIV and Viral Hepatitis. Beside some blood test, the donor also will ask about the medical history and given a short physical examination for sure that the donation have no risk to others.
The amount of blood will taken from blood donor for about 500 milliliters of whole blood. The tool to take out this blood can by manual tools or by automated equipment that only takes for specific portion of blood. The donor can give their blood every routine period, this is vary from several days to months that depend on the donate condition or country laws where the donation takes place.
The diseases that oblige as blood donor may vary:
- AIDS
- Hepatitis B
- Hepatitis C
- West Nile Virus
- Syphilis
- Malaria
- Rubella
- And Other Blood Diseases
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