- published: 06 Feb 2013
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The atrium (plural: atria) is one of the two blood collection chambers of the heart. It was previously called the auricle, but that name has now been in use as being synonymous with the right or left atrial appendage. The atrium is a chamber in which blood enters the heart, as opposed to the ventricle, where it is pushed out of the organ. It has a thin-walled structure that allows blood to return to the heart. There is at least one atrium in animals with a closed circulatory system.
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.
Humans have a four-chambered heart consisting of the right atrium, left atrium, right ventricle, and left ventricle. The atria, are the two upper chambers. The right atrium receives and holds deoxygenated blood from the superior vena cava, inferior vena cava, anterior cardiac veins and smallest cardiac veins and the coronary sinus, which it then sends down to the right ventricle (through the tricuspid valve) which in turn sends it to the pulmonary artery for pulmonary circulation. The left atrium receives the oxygenated blood from the left and right pulmonary veins, which it pumps to the left ventricle (through the mitral valve) for pumping out through the aorta for systemic circulation.
Atrium may refer to:
The heart is a muscular organ in humans and other animals, which pumps blood through the blood vessels of the circulatory system. Blood provides the body with oxygen and nutrients, and also assists in the removal of metabolic wastes. The heart is located in the middle compartment of the mediastinum in the chest.
In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria; and lower left and right ventricles. Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart. Fish in contrast have two chambers, an atrium and a ventricle, while reptiles have three chambers. In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.
The human body is the entire structure of a human being and comprises a head, neck, trunk (which includes the thorax and abdomen), arms and hands, legs and feet. Every part of the body is composed of various types of cells, the fundamental unit of life.
At maturity, the estimated average number of cells in the body is given as 37.2 trillion. This number is stated to be of partial data and to be used as a starting point for further calculations. The number given is arrived at by totalling the cell numbers of all the organs of the body and cell types. The composition of the human body is made up of a number of certain elements including carbon, calcium and phosphorus.
The study of the human body involves anatomy and physiology. The human body can show anatomical non-pathological anomalies known as variations which need to be able to be recognised. Physiology focuses on the systems and their organs of the human body and their functions. Many systems and mechanisms interact in order to maintain homeostasis.
Khan Academy is a non-profit educational organization created in 2006 by educator Salman Khan with the aim of providing a free, world-class education for anyone, anywhere. The organization produces short lectures in the form of YouTube videos. In addition to micro lectures, the organization's website features practice exercises and tools for educators. All resources are available for free to anyone around the world. The main language of the website is English, but the content is also available in other languages.
The founder of the organization, Salman Khan, was born in New Orleans, Louisiana, United States to immigrant parents from Bangladesh and India. After earning three degrees from the Massachusetts Institute of Technology (a BS in mathematics, a BS in electrical engineering and computer science, and an MEng in electrical engineering and computer science), he pursued an MBA from Harvard Business School.
In late 2004, Khan began tutoring his cousin Nadia who needed help with math using Yahoo!'s Doodle notepad.When other relatives and friends sought similar help, he decided that it would be more practical to distribute the tutorials on YouTube. The videos' popularity and the testimonials of appreciative students prompted Khan to quit his job in finance as a hedge fund analyst at Connective Capital Management in 2009, and focus on the tutorials (then released under the moniker "Khan Academy") full-time.
http://www.anatomyzone.com 3D anatomy tutorial on the features of the right atrium using the BioDigital Human (http://www.biodigitalhuman.com). This is a tutorial covering the internal and external features of the right atrium. The next part of this tutorial discusses the features of the right ventricle. The following structures are discussed in this tutorial: - superior and inferior vena cava - coronary sinus - atrioventricular orifice - tricuspid valve - sulcus terminalis - crista terminalis - right atria appendage/auricle - musculi pectinati - sinus venarum - sinus venosus - sinoatrial node - atrioventricular node Join the Facebook page for updates: http://www.facebook.com/anatomyzone Follow me on twitter: http://www.twitter.com/anatomyzone Subscribe to the channel for more vid...
Find more videos at: https://www.kenhub.com Subscribe to our YouTube channel: http://bit.ly/VOEG2I The atria are divided into the left atrium and the right atrium, which correspond to the left and right sides of the heart. They are situated just above the ventricles of the heart and are separated by the cuspid valves. The atria are built and held up by rigid endocardial muscle fibers that completely encompass the blood as it flows through them. The right atrium receives deoxygenated venous flow from the superior and inferior vena cavae, the coronary sinus as well as the anterior and the smallest cardiac veins. It passes the blood through the tricuspid valve, which has three septae and is also known as the right atrioventricular valve. For more Human Anatomy video tutorials, interactive ...
http://www.anatomyzone.com 3D anatomy tutorial on the left atrium using the BioDigital Human (http://www.biodigitalhuman.com). Join the Facebook page for updates: http://www.facebook.com/anatomyzone Follow me on twitter: http://www.twitter.com/anatomyzone Subscribe to the channel for more videos and updates: http://www.youtube.com/subscription_center?add_user=theanatomyzone
http://www.interactive-biology.com - In this video, I go through the process of how blood flows through the heart. It shows blood entering via the vena cave to the Right atrium, then getting pumped into the right ventricle, to the pulmonary vein to the lungs, to the left atria, left ventricle and then via the aorta to the rest of the body. Enjoy! http://www.interactive-biology.com
Blood flows through the atrium, ventricles, and heart valves. Learn the cardiac systemic and pulmonic circulations. Please SUBSCRIBE: More cool stuff coming as we get more HippoHelpers! Cardiac/Respiratory Playlist: http://www.youtube.com/playlist?list=PLIPkjUW-piR0QD_IsxkMTRA0LxdOcwJN6 See our clinical skills playlist at: http://www.youtube.com/playlist?list=PLIPkjUW-piR0-F25ydO8uI8DbHzuJKIcQ And visit http://www.helphipppo.com for more tutorial videos and flashcards.
This video was produced to help students of human anatomy at Modesto Junior College study our anatomical models.
An atrial septal defect is a hole between the two atriums of the heart. Normally this hole is present at birth but closes within a few days of life. Failure of this hole to close is called an atrial septal defect, and usually is asymptomatic (no obvious symptoms are present). Created by Leslie Samuel. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-cardiovascular-diseases/rn-non-cyanotic-heart-diseases/v/rn-ventricular-septal-defect?utm_source=YT&utm;_medium=Desc&utm;_campaign=Nclex-rn Missed the previous lesson? https://www.khanacademy.org/test-prep/nclex-rn/rn-cardiovascular-diseases/rn-non-cyanotic-heart-diseases/v/what-is-eisenmenger-syndrome?utm_source=YT&utm;_medium=Desc&utm;_campaign=Nclex-rn NCLEX-RN on Khan Academy: A collection of questions from content c...
Find more videos at: https://www.kenhub.com Subscribe to our YouTube channel: http://bit.ly/VOEG2I The atria of the heart, which are known singularly as an atrium, are a pair of blood collecting chambers that comprise two of the four chambers of the heart. The atria are divided into the left atrium and the right atrium, which correspond to the left and right sides of the heart. They are situated just above the ventricles of the heart and are separated by the cuspid valves. The atria are built and held up by rigid endocardial muscle fibers that completely encompass the blood as it flows through them. The left atrium is responsible for collecting the outflow of oxygenated blood that runs back to the heart from the pulmonary veins. It passes this volume of blood on to the left ventricle, ...
This video was produced to help students of human anatomy at Modesto Junior College study our anatomical models.