2006-08-02 08:39:19 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Same way all living creatures do: by having a heart that pumps blood.
Or is your question badly written?
2006-08-02 08:43:37 · answer #1 · answered by Vincent G 7 · 0⤊ 0⤋
Blood pressure is maintained by an intricate interplay between many body systems such as heart rate and strength of contraction, elasticity of the arteries and vein, permeability of the capillaries, renal function.
One way valve in carotid artery prevents extreme blood pressure in brain when head is down to eat/drink. Reticular capillaries diffuse the pressure at base of brain.
2006-08-06 11:52:11 · answer #2 · answered by Allasse 5 · 0⤊ 0⤋
Most organisms use a few different methods...
Renal control of filtration that will cause changes in blood pressure
Arterial or vein constriction or dilation
Increased or decrease in frequency or intensity of heart beat
In fact is is a very complicated web of all of these fuctions along with resulting nerve and hormone stimulations that will regulate the blood pressure.
2006-08-02 16:50:52 · answer #3 · answered by Anonymous · 0⤊ 0⤋
When their head is up, the arteries loosen, when the head is down they constrict to prevent too much blood from going to the head.
2006-08-02 15:45:08 · answer #4 · answered by ConradD 2 · 0⤊ 0⤋
It is built into the design.
2006-08-02 15:44:56 · answer #5 · answered by ♣ My Brainhurts ♣ 5 · 0⤊ 0⤋