The blood-brain barrier is thought to exist because capillaries in the central nervous system have which of the following characteristics?
Capillaries in the CNS have a continuous basal lamina and thus lack fenestrae. In contrast to continuous capillaries in other pas of the body, they contain only a few pinocytic vesicles; this characteristic is thought to be paly responsible for the blood-brain barrier
Discontinuous basal lamina
Fenestrae with diaphragms
Fenestrae without diaphragms
A few pinocytic vesicles
Circulation