Heart

Alongside pumping blood, atrial cells release a natriuretic hormone. Organs can both perform a mechanical task and send chemical signals.

Receptor location — biological context

A receptor in an organ does not prove that this compound reaches or affects that organ.

GLP1R
Homo sapiens · non-human primates
The study localized GLP1R to muscle cells of the sinoatrial node, a region involved in setting heart rhythm. This is a finding in a specific cell population, not the whole heart.
Source: Pyke et al., 2014

The atlas is being expanded. Missing links indicate gaps in this map, not absence of biology.