This chapter contains sections titled:

• Introduction

• Role in asthmatic responses

• Descriptions of airway vessels

• Airway blood flow

• Impact of increased airway vascularity on airway caliber

• Vasodilatation and angiogenesis

• Drivers of angiogenesis

• Bronchial vessels and the immune response

• Angioblasts and stem cells

• Vessel leakage

• Pharmacologic responsiveness

• References