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The same question was asked at another site and this was the answer given:
As an example, on average a normal, healthy individual who donates a
unit of blood (about 450 ml or ¾ pint) will fully recuperate from the
blood loss in four to six weeks.
The issue is a bit more complicated than that though. You see, our
blood is made up of a variety of things:
Red blood cells that carry oxygen from the lungs to all other tissues in the body.
White blood cells that provide the body's defenses against disease.
Platelets, specialized cells that plug damaged blood vessel walls and
join other elements in the blood in the production of clots to stop
bleeding.
Plasma, a yellow fluid made up of about 92% water and 7% vital
proteins such as albumin, gamma globulin, and antihemophilic and other
clotting factors.
And other elements consisting of mineral salts, sugar, fats, hormones,
and vitamins.
Red blood cells, white blood cells, and platelets account for about
45% of the volume of blood in the body. The remaining 55% is plasma
including the other extraneous elements I mentioned. The four to
six-week period I indicated a moment ago is the time necessary to
replace ALL these factors, though our bodies actually replace some of
the individual components faster than others. For example, the fluid
(mostly water) lost in a blood donation, is replaced in only a few
hours, provided the donor drinks a moderate amount of water or
healthy, non-alcoholic liquids to replenish the loss. The other
components of the blood, such as platelets and red cells begin to
replenish immediately but take a bit longer to complete; usually
within a few days or weeks depending on how much blood is lost.
Generally speaking, after donating a unit of blood, the body replaces
the fluid and white cells within 24 hours, and platelets and plasma
proteins within 48-72 hours. The red blood cells are completely
replaced in 4-6 weeks.
It would be safe then to say that a blood ?sample? (rather that a
whole unit) or a small amount of loss due to a very minor scrape or
bleed could conceivably be fully replaced in a healthy individual
within hours. How fast the entire blood loss is replenished obviously
depends on the amount of blood lost, the size of the individual (for
every 12-15 pounds of body weight, a human being has about one pint of
blood) and the health of the individual from whom the blood is
removed. If the body is functioning normally and there are no
extenuating circumstances (interfering medication, unhealthy lifestyle
or diet, etc) age alone should have little or no impact on the natural
replacement of blood. A poor diet or sedentary lifestyle can however
have an impact on how fast the body replaces blood because of the
necessary nutrients in a proper diet that enable the cell replacement.
Lack of exercise, for example, can lead to obesity (and ultimately the
need for more blood than normal) and can certainly cause
arteriosclerosis or other venous constrictions than can complicate
blood flow, adding to difficultly or delayed replacement. This of
course is just one hypothetical situation, but there are others.
Replacement is also relative to size and exercise (or lack thereof) If
a pint of blood is a significant portion of a person?s entire blood
volume (as in a newborn for example) it will take longer for the body
to replace half the blood volume. In a 500lb man, a pint of blood is
not that much in terms of overall blood volume, BUT his body may have
a difficult time replacing that pint in the normal range of
expectations because of his morbid obesity and other health factors.
So you can easily see how diet and excercise can affect blood
replacement.
As a rule though, if you are relatively healthy, eat right more often
than not, and even moderately exercise you can expect a fairly
predictable and complete replacement of a non-life threatening blood
loss within the time frame I specified regardless of your age.
Wiki User
∙ 14y ago
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What primary blood supply to the diaphysis of a long bone is through the?
The nourishing part of any bone is the periosteum. It is the connective tissue that is vascular and surrounds the shaft of long bones, like the femur, with the blood it needs to stay healthy.
How long does it take a blood clot in the anterior chamber of the human eye to resolve?
2 weeks
How long does blood take to circulate through the human body 1 or 5 minutes?
about one minute
What is the column of the bone?
The shaft or long, main part of a long bone is called the diaphysis. There are also columns within compact bones called central (Haversian) canals through which blood vessels and nerves travel to supply blood and innervation to the bone cells (osteocytes).
How long can the average human last in a rear naked choke?
A couple of minuts. No blood-flow to the brain will cause death.
How long does it take to regenerate a pint of blood?
48 hours
How long to regenerate a pint of blood?
To regenerate a pint of blood it takes upto 6 weeks. Yet after first transfusion, 2nd transfusion is not accepted within 12 weeks. In a healthy adult with good diet and exercise the plasma and WBCs regenerate in 24 hrs, the platelets and protiens in 48 hrs, the RBCs within 4 to 6 weeks.
How long does it take for planaria to regenerate?
It takes about two weeks for a planarian to regenerate.
How can a human regenerate when they die?
to die is to live no longer, you cannot regenerate when you die, your heart no longer beats, your brain is no longer active, you'd have no life, ever lean or lay on your arm too long and theres no blood that goes into it? and all you feel is numbness and its heavy? well, take that as an example of what your body may feel like after your dead. The only thing you'll regenerate after your casket pops open from being in the ground a very long time, are daisy's and other flowers, sometimes the occassional tree, depending on where your grave is located.....
How long you will lose consciousness if the supply of blood to your brain is interrupted for only?
you will die
A sentence for regenerate?
The word regenerate means to be reborn or reformed or the regrowth of the injured tissue of a living organism. You can use it in a sentence like, after a long week I just want to regenerate and relax.
Why do joint injuries take a long time to heal?
Its due to poor perfusion (blood supply)
Where can you find long wavy human hair half wigs?
At your local beauty supply or online.
How long can the human heart survive without oxygen?
as such its very vague. because it depends on part to part if the upper limb. loss of blood supply to any of the body organs can lead to avascular necrosis i.e death of the tissue due to loss of blood supply. some parts are very sensitive to this as necrose immidiately after loss of blood supply whereas some parts can resist the stress and necrose after some time. but its generally said that that the avascularized part's blood supply should be fixed within 5 to 8 hours(for muscles generally) (but brain dies if it doesn't get fresh blood supply within 15 minutes as it can utilize only glucose)
Are there really human vampires?
Yes...do you believe in me... I come from a long line of vampires from Europe.... I drink animal blood not human blood... I hope that answers your question.
How long does blood cells survive in the human body?
90 to 120 days
The large bones work with the circulatory system to produce blood cells why is this important?
A red blood cell lives only 100 to 120 days after being released from the bone marrow into the blood. The marrow of the long bones continually manufactures new red blood cells to replenish the supply of about 30 trillion red blood cells needed by the circulatory system of a healthy adult human.
