Atrium (heart) - Citizendia

In anatomy, the atrium (plural: atria) refers to a chamber or space. Anatomy (from the Greek anatomia, from ana separate apart from and temnein, to cut up cut open is a branch of Biology that is the consideration As such it may for example be the atrium of the lateral ventricle in the brain or, popularly, the blood collection chamber of a heart. Blood is a specialized Bodily fluid that delivers necessary substances to the body's cells ��such as nutrients and oxygen—and transports Waste products The heart is a muscular organ in all Vertebrates responsible for pumping Blood through the Blood vessels by repeated rhythmic It has a thin-walled structure that allows blood to return to the heart. There is at least one atrium in an animal with a closed circulatory system. This is an article about the rock music band "Circulatory System" In fish, the circulatory system is very simple: a two-chambered heart including one atrium and one ventricle. Fish are aquatic Vertebrate animals that are typically ectothermic (previously Cold-blooded) covered with scales, and equipped with two In the Heart, a ventricle is a heart chamber which collects Blood from an atrium (another heart chamber that is smaller than a ventricle and In other vertebrate groups, the circulatory system is much more complicated. Vertebrates are members of the Subphylum Vertebrata, Chordates with backbones or spinal columns The grouping sometimes includes This is an article about the rock music band "Circulatory System" Their circulatory systems are divided into two types: a three-chambered heart, with two atria and one ventricle, or a four-chambered heart, with two atria and two ventricles. The atrium receives blood as it returns to the heart to complete a circulating cycle, whereas the ventricle pumps blood out of the heart to start a new cycle.

Human heart

Humans have a four-chambered heart. Human beings, humans or man (Origin 1590–1600 L homō man OL hemō the earthly one (see Humus The right atrium receives de-oxygenated blood from the superior vena cava, inferior vena cava and coronary sinus. The superior vena cava is a large yet short Vein that carries deoxygenated Blood from the upper half of the body to the Heart 's Right atrium The inferior vena cava (or IVC is the large Vein that carries de-oxygenated Blood from the lower half of the body into the Heart. The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the Myocardium of the Heart. The left atrium receives oxygenated blood from the left and right pulmonary veins. The four pulmonary veins carry Oxygen -rich Blood from the Lungs to the left atrium of the Heart. The atria do not have valves at their inlets. As a result, a venous pulsation is normal and can be detected in the jugular vein. The jugular veins are Veins that bring deoxygenated blood from the Head back to the heart via the Superior vena cava.

Internally, there is the rough musculae pectinati and crista terminalis, which acts as a boundary inside the atrium and the smooth walled part derived from the sinus venosus. In the development of the human Heart, the right horn and transverse portion of the Sinus venosus ultimately become incorporated with and form a part of the adult Right This article is on an embryological structure For the heart defect of the same name please see atrial septal defect. There is also a fossa ovalis in the interatrial septum which is used in the fetal period as a means of bypassing the lung. For the structure in the thigh see Fossa ovalis (thigh. Found in the right atrium of the heart the fossa ovalis is an embryonic remnant of the The interatrial septum is the wall of tissue that separates the right and left atria of the Heart. A fetus (or foetus or fœtus) is a developing Mammal or other Viviparous Vertebrate, after the Embryonic stage and

There are two atria, one on either side of the heart. On the right side is the atrium that holds blood that needs oxygen. It sends blood to the right ventricle which sends it to the lungs for oxygen. After it comes back, it is sent to the left atrium. The blood is pumped from the left atrium and sent to the ventricle where it is sent to the aorta which takes it to the rest of the body.

Human heart

See also