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.
Auxin is the first group of plant hormones that was discovered by scientists in 1926. Auxin is mainly present in the form of indole acetic acid (IAA) in plants. However, there are other chemical compounds also found in plants that exhibit functions similar to auxins.One of the major functions of the IAA is to stimulate cell elongation of the young shoots.uxin is the first group of plant hormones that was discovered by scientists in 1926. Auxin is mainly present in the form of indole acetic acid (IAA) in plants. However, there are other chemical compounds also found in plants that exhibit functions similar to auxins.