please help me understand the mechanism that raises the blood volume back to normal following a fall in level?

Question

what is this controlled variable i have looked it up but just dont understand it

Answer 1

Acute measures taken by the body mechanism are:
Liver ; about 500ml is reserved and it gushes out in the circulatory system.
Spleen; about 150ml is present in the spleen and this reserve can be moblised if necessary.
Bone marrow; kidney immediately reacts and erythropoeitin is secreted to bone marrow to initiate fresh production urgent of RBC.
Sympathetic nerves can initiate vasoconstriction to divert blood to the heart.
THE VOLUME IS CONTROLLED BY CENTRAL VENOUS PRESSURE WHICH SIGNALS WHEN SUFFICIENT VOLUME IS ACHIEVED AND ALL THE ABOVE MECHANISMS COME TO A STAND STILL.

Answer 2

You in good shape. But not eating for 10 hours and having a level of 71 is not good. My son is not a diabetic and if he gos that long he get light headed and has passed out. A sugar reading of 133 would be about right for a diabetic 2 hrs. after eating. But that would be the high for all test, no higher. Why are you testing? Look up the symptoms and see if you have any of them before you panic, maybe you just have to much time on you hands. If any of your family has Diabetes ,then yes you need to keep a eye on your blood sugar. If I ate all that sugar I would read over 320. Yes I know Peep are a killer. I Had a hard time walking past then in the store. Also any chocolate cover marshmallows get me, it like they are calling my name even from out side the store. Hell even typing this I can hear the darn peep, chirping.

Answer 3

Thats fascinating. I dont know jmust wanted to wonder at the marvel of the human body.
I understood the liver stored blood and controlled the usable volume.
The variable cant be pressure because that varies independantly of volume so is it something to do with the size of a storage space internal to the liver??

Just a guess mind.

Answer 4

The body doesn't measure blood volume, only blood pressure.
The low pressure baroreceptors are involved with the regulation of blood volume.
These are found in the large veins and in the walls of the atria of the heart. The blood volume determines the mean pressure throughout the system, in particular in the venous side where most of the blood is held.

The low pressure baroreceptors have both circulatory and renal effects, they produce changes in hormone secretion which have profound effects on the retention of salt and water and also influence intake of salt and water. The renal effects allow the receptors to change the mean pressure in the system in the long term.

Answer 5

hii there!!
For your body to work properly, the conditions inside it, such as water, pH and salt levels, need to be kept constant. Your kidneys play a vital role in keeping your blood composition constant. They filter your blood to remove excess water and waste products, which are secreted from your kidneys as urine.

One quarter of your blood supply passes through your kidneys every minute. It enters your kidney and is distributed to minute filtration units known as nephrons. Each of your kidneys contains more than one million nephrons. The main substances your nephrons filter out of your blood are:

* Water
* Nitrogen-containing compounds like urea that are produced when your body breaks down proteins
* Salts
* Acids
* Alkalis

Your nephrons filter these substances out of your blood and then reabsorb some of them back into your blood. This keeps your blood composition constant. Excess water and waste products are then secreted as urine. Your kidneys vary the amount of a substance that is reabsorbed into the blood or secreted as urine. This determines the volume and composition of your urine. For example, when you drink a lot of water, your kidneys produce a lot of urine to stop the water levels in your body getting too high. But, if you don't drink much, your kidneys only produce a small amount of concentrated urine, keeping as much water as possible in your body.

In 24 hours, your kidneys filter around 150 litres of blood and produce roughly 1.5 litres of urine.

http://www.bbc.co.uk/science/humanbody/body/factfiles/kidneys/kidneys.shtml

Answer 6

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