Assertion: giraffe's system | /r/MadeOf | small arterieswhich dilate
Facets:
value: to varying degrees
type: OTHER
Source sentences:
text: Because of the great distance between the heart and the head (situated far above the animal’s head, and far below the head), giraffes need a regulatory mechanism that keeps the blood pressure in the brain constant ; for this they have a system formed by small arterieswhich dilate to varying degrees, and allow blood pressure to stabilize in the brain.