serious anwsers only please.
Its for a science course.
2006-07-27 02:56:08 · 2 answers · asked by Sars999 2 in Education & Reference ➔ Primary & Secondary Education
THE BLOOD FLOWS TRU THE EARS AND THE AIR COOLS THE BLOOD...
2006-07-27 03:00:32 · answer #1 · answered by darkpony6262 3 · 0⤊ 0⤋
A hare's large ears have what is called a large surface area to volume ratio. This means that the relatively small amount of actual tissue has been formed into a relatively thin and there fore large area.
This large area is full of tiny capillaries through which blood flows very near the skin (as the ear is relatively thin) . In summer when the temperatures are high and the animal gets hot, it can lose heat by radiation ie the heat from the capillaries moves to the relatively cooler air and thus cools the hare down. As an animals temperature increases, reactions occur that dilate the blood vessels near the surface allowing increased blood flow to increase the amount of heat that can be lost. Conversely when the environment cools, the blood vessels constrict, retaining heat within the body core to keep the animal warm by preventing heat loss. hope this helps
2006-07-30 02:33:25 · answer #2 · answered by Allasse 5 · 0⤊ 0⤋