Can asexual get hard?

Excuse me, but I'm curious about something related to human sexuality. Could you please clarify if it's possible for an individual who identifies as asexual to experience physical arousal or get "hard," as it's commonly referred to in male anatomy? I understand that asexuality is a spectrum and varies in expression, but I'm wondering if there's a general answer to this question within the context of human physiology and sexual identity.