Cerebral blood flow (CBF) is the blood supply to the brain in a given period of time.In an adult, CBF is typically 750 millilitres per minute or 15% of the cardiac output.This equates to an average perfusion of 50 to 54 millilitres of blood per 100 grams of brain tissue per minute. CBF is tightly regulated to meet the brain's metabolic demands.oo little blood flow (ischemia) results if blood flow to the brain is below 18 to 20 ml per 100 g per minute, and tissue death occurs if flow dips below 8 to 10 ml per 100 g per minute.
Ears back often means the dog is being submissive or even a little fearful. The situation you describe sounds like a dog that is trying to appease you. You are a little scary to her. Try approaching her sideways, in a crouched position rather than hovering over her.
They do it as a  means to better hear something as wel â¦ l, since their ears are  funnel-shaped so that they can better hear something that may be  either friendly or not--friendly that being something to not worry  about, not being something they may want to flee from. 1 person found this useful.xists and is an alternate of. Merge this question into. Split and merge into it. Answered by The Community. Making the world better, one answer at a time. Why cows and dogs prick their ears They prick their ears because it helps them pinpoint exactly where a certain sound is coming from.