Atria is plural for Atrium. You have your (rt)Atrium and (lt)Atrium
Atrium is singular - the plural is atria.
Are is plural. "Is" is singular. For example, "There is a glove on the chair". That is singular. "There are gloves on the chair". That is plural.
Who may be singular or plural.
diagnosis is singular diagnoses is plural sis = singular ses = plural
Statistics is plural, the singular form is statistic.
Atrium is singular - the plural is atria.
The Atria and Atrium
Atria is the plural for of atrium. Not the other way around.
The plural is atria. This can be used architecturally or with reference to chambers of the heart.
the upper chambers of the heart are called the atria. (or atrium singular)
it is located in the heartThe Atria (plural) or Atrium (singular) are the chambers located in the top of the heart. Below the Atria are the Ventricles.There are two atria in the heart, the left atrium and the right atrium.Atria are located in the heart.
practitioner is singular (plural practitioners)sofa is singular (plural sofas)satellite is singular (plural satellites)clips is plural (singular clip)dentist is singular (plural dentists)dollars is plural (singular dollar)article is singular (plural articles)magazines is plural (singular magazine)laminator is singular (laminators is plural)radios is plural (singular radio)
singular and plural
Singular: book / Plural: books Singular: cat / Plural: cats Singular: child / Plural: children Singular: foot / Plural: feet
Are is plural. "Is" is singular. For example, "There is a glove on the chair". That is singular. "There are gloves on the chair". That is plural.
"Has" is singular, e.g. He has, she has. "Have" is plural, e.g. They have, we have. The exception is "I" - e.g. I have.
The plural form of the word atrium is atria. The atria are the two upper cavities of the heart from which blood is passed to the ventricles.