Because there is no blood/pressure within the atria to keep it open
The are extentions of the Atria.
The left and right atrium (or atria).
The heart is the organ that has two atria and one ventricle.
Auricles
the difference between the ventricles and the atria is that the ventricles are thicker
the atria
The are extentions of the Atria.
The atria are a part of your heart which is in the circulatory system
The Atria and Atrium
salamanders have a heart with one ventricle and two atria
Atria is the plural for of atrium. Not the other way around.
The are extentions of the Atria.
One atria
Atria (left and right)
The atria allow the blood to move from the body into the heart.
Rita Atria died in 1992.
Rita Atria was born in 1974.