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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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 ...
coronary sinus (great cardiac, left marginal, small cardiac, middle cardiac, posterior of the left ventricle, oblique of the left atrium) - anterior cardiac (right marginal) - pulmonary
Thorax/
SVC ...
In the fetus, most of the blood passes directly from the right atrium to the left atrium through a hole called the foramen ovale, which closes up in time.
oxygenated blood from the left atrium is sent, relatively pure, into the carotid arteries taking blood to the head (and brain); ...
(Science: anatomy) The muscular chamber of the heart which accepts blood from the left atrium and ejects it into the aorta to the systemic circulation.
[L. pulmonis, lung]
In birds and mammals, a vein that carries oxygenated blood from the lungs to the left atrium of the heart, from which blood is pumped into the left ventricle and from there to the body tissues.
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pulmonary vein The vein that carries oxygenated blood from the lungs to the left atrium of the heart. Veins carrying oxygenated blood from the lungs to the heart. PICTURE ...
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. It is then pumped out to your body via your left ventricle.
pulmonary circuit The system of blood vessels from the right ventricle of the heart to the lungs, transporting deoxygenated blood and returning oxygenated blood from the lungs to the left atrium of the heart.
At the same time, oxygenated blood from the lungs flows from the pulmonary vein into the left atrium. The muscles of both atria contract, forcing blood downward through each AV valve into each ventricle.
 See also: Heart, Atrium, Blood, Human, Ventricle
  
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