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.
That's why they don't vary as much in size as dogs do. They are also mainly nocturnal animals so it is advantageous for them to have upright ears on the tops of their heads. They can move each ear independently to pick up sounds, Cats rely on their hearing more than dogs do but both animals have good hearing.he reason dogs have different shaped ears is due to their breeding. Most dogs were bred to do specific jobs. Some of those jobs were better suited to dogs that had sloping ears while others were fine for those with upright ears. People need to remember that all dogs were bred from wolves, which do have upright ears.