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.
Best Answer: He lowers his head to appear smaller and less threatening. He probably pulls his ears down or back as well. It's the same thing. These signals tell other dogs that he does not mean to start any sort of challenge or fight. He doesn't know that humans don't always understand this.est Answer: He lowers his head to appear smaller and less threatening. He probably pulls his ears down or back as well. It's the same thing. These signals tell other dogs that he does not mean to start any sort of challenge or fight. He doesn't know that humans don't always understand this.