The upper chambers in the heart, they receive blood from the veins and store it prior to each heartbeat
The upper two chambers of the heart that accept and accumulate blood prior to the blood being allowed into the ventricular chambers from which the blood is pumped to the body and to the lungs
plural of atrium Blood is returned from the lungs, to the left atrium, from where it is pumped into the left ventricle and then round the body, or from the body, to the left atrium be pumped into the right ventricle and then to the lungs
A cavity inside a porate aperture of a pollen grain formed by the separation of the sexine and nexine layers, widening toward the interior of the grain
An upper chamber of the heart that receives blood from the veins and forces it into a ventricle. In higher vertebrates, the right atrium receives blood from the superior vena cava and inferior vena cava, and the left atrium receives blood from the left and right pulmonary veins
An open courtyard at the entrance of a church, usually surrounded by covered aisles The atrium of the Early Christian church was originally a place for the catechumens to wait during the celebration of the Eucharist
In classical architecture, an interior courtyard that is open to the weather In contemporary architecture, a significant interior space, often skylighted, used for circulation
the central area in a building; open to the sky any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)
An atrium is a part of a building such as a hotel or shopping centre, which extends up through several floors of the building and often has a glass roof. In an ancient Roman house, an open central court that contained the impluvium, a basin where rainwater collected. It originally contained the hearth and functioned as the center of family life. The term later came to be used for the open front courtyard of a Christian basilica, where congregants collected before services. The atrium was revived in the 20th century in the form of glass-covered, greenery-filled multistory spaces sometimes found in shopping centers, office buildings, and large hotels
The top filling chamber of the heart There are two atria - the left and the right, divided by a muscular wall, called the septum The atrium contracts before the ventricle to allow optimal filling of the ventricle
A body cavity or chamber, especially an upper chamber of the heart that receives blood from the veins and forces it into a ventricle. An auricle. In higher vertebrates, the right atrium receives blood from the superior vena cava and inferior vena cava, and the left atrium receives blood from the left and right pulmonary veins
Upper chamber of the heart; right atrium receives blood low in oxygen from the body and pumps it into the right ventricle so it can move to the lungs for oxygen; left atrium receives blood rich in oxygen from lungs and pumps it into the left ventricle so it can move through the aorta, into the rest of the body
Either of the two upper chambers of the heart Blood returned from the upper body to the heart from the veins enters the right atrium through the superior vena cava, and through the inferior vena cava from the lower body The vena cava is the body's largest vein Oxygen-rich blood is returned to the left atrium from the lungs
An entrance hall of a building, often rising through a number of storeys and containing lifts, reception areas and plants Originally the hall or chief apartment of a Roman house
1 Central courtyard or hall open to the sky and surrounded on all sides by roofed areas, often with a colonnade 2 In traditional Christian church architecture: an open court in front of a church, usually a colonnaded quadrangle
There are four chambers in the heart, two on the right side pumping to the lungs, and two on the left side pumping to the body On each side there is an upper, low-pressure chamber that collects blood from the veins and delivers it to the ventricles, the main pumping chambers of the heart These upper chambers are called the atria (plural) or atrium (singular)
One of the two receiving chambers of the heart The left atrium receives oxygen-rich blood from the lungs The right atrium receives oxygen-depleted blood from the body