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 primary function of the auxin hormones is to elongate plant cells in the stem. Auxins are also responsible for root development, secondary growth in the vascular cambium, inhibition of lateral branching, and fruit development.