Physiology The blood-brain barrier is thought to exist because capillaries in the central nervous system have which of the following characteristics? A Discontinuous basal lamina B Fenestrae with diaphragms C Fenestrae without diaphragms D A few pinocytic vesicles 💡 Explanation The blood-brain barrier is thought to exist because capillaries in the central nervous system have which of the following characteristics? ✓ Correct Answer: D. A few pinocytic vesicles