AIM:In intact airway smooth muscle, part of the refilling of internal, agonist-sensitive calcium stores is unsensitive to inhibition of SR ATPase. This ATPase-inhibition- insensitive component of refilling disappears in the presence of an L-type calcium channel antagonist, and is po AIM: In intact airway smooth muscle, part of the refilling of internal, agonist-sensitive calcium stores is unsensitive to inhibition of SR ATPase. This ATPase-inhibition- insensitive component of refilling disappears in the presence of an L-type calcium channel antagonist, and is po