Atrium
[L. atrium - hall] In the embryo, it is the chamber of the heart that receives blood from the sinus venosus and delivers blood to the ventricle.
atrium pl. atria
(a-tree-um) [L. yard, court, hall]
A chamber that receives blood returning to the vertebrate heart.
autogenesis model ...
Left Atrium (atrium sinistum; left auricle)."The left atrium is rather smaller than the right, but its walls are thicker, measuring about 3 mm.; it consists, like the right, of two parts, a principal cavity and an auricula.
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atrium One of the chambers of the heart; also, the tympanic cavity of the ear; also, the large cavity containing the pharynx in tunicates and cephalochordates.
The atrium receives deoxygenated blood from the blood vessels (veins) that drain the various organs of the body.
The left atrium receives oxygenated blood from the lungs and skin (which also serves as a gas exchange organ in most amphibians).
Left atrium receives blood from lungs via 4 separate pulmonary veins
Systole refers to a period of contraction by heart muscle
Diastole refers to a period of relaxation by heart muscle
Atrial systole ...
Your right atrium takes in the oxygen poor blood. It is then pumped to your lungs via the right ventricle. In your lungs, your blood again fills up with oxygen, and returns to your heart. Your blood now enters the left atrium of your heart.
Biloculare a congenital anomaly characterised by failure of formation of the atrial and ventricular septums, the heart having only two chambers, a single atrium and a single ventricle and a common atrioventricular valve. C.
They are highly muscularized portions of the circulatory system, often with a thin walled atrium, thick walled ventricle and valves to prevent back flow.
Starting in the right atrium, the blood flows through the tricuspid valve to the right ventricle. Here it is pumped out the pulmonary semilunar valve and travels through the pulmonary artery to the lungs.
Human heartbeats originate from the sinoatrial node (SA node) near the right atrium. Modified muscle cells contract, sending a signal to other muscle cells in the heart to contract. The signal spreads to the atrioventricular node (AV node).
sinoatrial (SA) node A region of modi?ed muscle cells in the right atrium that sends timed impulses to the heart's other muscle cells, causing them to contract; the heart's pacemaker. PICTURE ...
 See also: Heart, Blood, Human, Trans, Tissue
  
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