What does "beds" mean here?
A ventricle is one of two large chambers in the heart that collect and expel blood received from an atrium towards the peripheral beds within the body and lungs. The atrium (an adjacent/upper heart chamber that is smaller than a ventricle) primes the pump.
Source: Ventricle (heart) - Wikipedia
I wonder if it means spaces, chambers or body cavities.
I've already googled it, but couldn't find anything.
1.a piece of furniture upon which or within which a person sleeps, rests, or stays when not well.
2.the mattress and bedclothes together with the bedstead of a bed.
3.the bedstead alone.
(However, maybe it's a mistake from Wikipedia)