The Heart's own pace maker
The heart beats regularly because it has it's own pacemaker. The pacemaker is a small region of muscle called the sinoatrial, or SA, node. It is in the upper back wall of the right atrium. The node triggers an impulse that causes both atrium to contract. Very quickly, the impulse reaches the atrioventricular, or AV, node at the bottom of the right atrium. Immediately, the atrioventricular node triggers an impulse that causes both ventricles to contract.
TRUE
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.
Because there is no blood/pressure within the atria to keep it open
Yes, the atria are the superior chambers of the heart.
The "anterooms" of the heart are also known as the atria.
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.
Purkinje fibers
The tricuspid valve is located between the right atria and ventricle.
located superiorly and are the receiving chambers of the heart
Felines have two atria in their hearts. Located on either side of the organ, they are called the right atrium and the left atrium.
TRUE
The are extentions of the Atria.
the atria
The atria are a part of your heart which is in the circulatory system
The sinoatrial (SA) node, located in the right atrium of the heart, is responsible for generating electrical impulses that spread out and stimulate the atria to contract.