1. The upper chamber of each half of the heart
   - atrium of the heart

Type of: atrium

• Bryanthus taxifolius
• Bryce Canyon National Park
• Brynhild
• bryology
• Bryonia alba
• Bryonia dioica
• bryony
• Bryophyta
• bryophyte
• bryophytic
• Bryopsida
• Bryozoa
• bryozoan
• Brythonic
• Bryum
• BS
• BSArch
• BSc
• BSE
• BSL
• BST
• BTDT
• BTU
• BTW
• bub