Biology · Neurobiology & Brain Function

With reference to the role of connexin proteins in brain function, consider the following statements: I. Connexin proteins such as Cx37 and Cx40 enable rapid communication between arteries by forming gap junctions. II. Studies indicate that when arteries lack connexin proteins, the hyperpolarization response to neuronal activity is significantly slower and less efficient. III. The widening of blood vessels to support brain activity begins first in large upstream arteries before spreading to small downstream capillaries. How many of the above statements are correct?