Definition

1. Noun:
   • The upper chamber of each half of the heart: An "atrium of the heart" is one of the two upper chambers in the heart that receive blood from the veins and push it into the lower chambers, the ventricles. The right atrium receives deoxygenated blood from the body, and the left atrium receives oxygenated blood from the lungs.

Usage

• The term "atrium of the heart" is used in anatomical, medical, and biological contexts to specify the upper chambers. It is often simply called an "atrium," but the full phrase clarifies the specific biological structure.
• It is typically used in singular ("atrium") or plural ("atria") forms when discussing the heart's anatomy.

Examples

• Noun:
  • Blood flows from the veins into the atrium of the heart.
  • The right atrium of the heart receives blood from the superior and inferior vena cava.
  • A common heart defect involves a hole between the two atria of the heart.

Advanced Usage

• "Atrial": Pertaining to an atrium.
  • Atrial fibrillation is a condition affecting the rhythm of the atrium of the heart.

Variants and Related Words

• Atrium (n): The more common short form for "atrium of the heart."
• Atria (n): The plural form of atrium.
• Auricle (n): A term sometimes used synonymously with atrium, though it can also refer specifically to the ear-shaped appendage of the atrium.
• Heart chamber (n): A general term that includes both atria and ventricles.

Synonyms

• Upper chamber (of the heart): A descriptive synonym.
• Auricle: (Note: This can be ambiguous as it also refers to the outer ear.)

Antonyms

• Ventricle (of the heart): The lower chamber of each half of the heart, which pumps blood out to the body or lungs.

Related Phrases

• Atrial septum: The wall separating the right and left atria of the heart.
• Atrioventricular valve: The valve between an atrium and a ventricle of the heart.

Noun

1. the upper chamber of each half of the heart