This makes their blood pressure double the amount of most mammals! In the upper portion of their necks there is a complex pressure regulatation system that maintains blood flow when the giraffe bends down to drink.In their brain there are elastic blood vessels that connect to one way valves in the neck to prevent the head from swellin when they bend over.his makes their blood pressure double the amount of most mammals! In the upper portion of their necks there is a complex pressure regulatation system that maintains blood flow when the giraffe bends down to drink.
A plant hormone that promotes root formation and bud growth.An auxin is a growth regulating substance that can be found in the meristems of plants. The concentration of auxin has the deciding effect on how much (and where) growth occurs in a plant.
The way that plants respond to the stimuli of light and gravity have been explained in terms of a chemical called auxin. Auxin functions like a plant hormone, but it may also be known as a plant growth substance.he way that plants respond to the stimuli of light and gravity have been explained in terms of a chemical called auxin. Auxin functions like a plant hormone, but it may also be known as a plant growth substance.