--- title: "Right Atrioventricular Valve | Anatomy I" description: "The right atrioventricular valve, or tricuspid valve, sits between the right atrium and right ventricle and stops blood from flowing backward." canonical: "https://fiveable.me/anatomy-physiology/key-terms/right-atrioventricular-valve" type: "key-term" subject: "Anatomy and Physiology I" unit: "Unit 17" --- # Right Atrioventricular Valve | Anatomy I ## Definition The right atrioventricular valve is the tricuspid valve between the right atrium and right ventricle. It opens to let blood move forward and closes when the right ventricle contracts. ## What It Is The right atrioventricular valve is the tricuspid valve in Anatomy and Physiology I, the flap-like gate between the right atrium and right ventricle. Its job is simple but nonstop: let blood move forward into the ventricle, then shut so blood does not leak back when the ventricle squeezes. It has three cusps, which is why it is called the tricuspid valve. Those cusps are anchored by chordae tendineae, the tough string-like cords that attach to papillary muscles in the right ventricle. This support system keeps the valve from flipping backward under pressure during ventricular contraction. The sequence matters. Blood comes into the right atrium from the body, passes through the open right atrioventricular valve into the right ventricle, and then the valve closes as the ventricle contracts. That closure helps direct blood out through the pulmonary valve and into the pulmonary trunk, instead of sending it back into the atrium. A good way to picture it is as a one-way doorway with extra support straps. It is not an active pump, and it does not move blood by itself. It responds to pressure changes inside the heart, opening when atrial pressure is higher and closing when ventricular pressure rises. Because this valve sits on the right side of the heart, it handles the lower-pressure return of deoxygenated blood headed to the lungs. That makes it part of the bigger flow pattern of the cardiac cycle, where valves keep circulation organized and efficient rather than letting blood slosh backward. ## Why It Matters This valve shows up whenever you trace blood flow through the heart, which is a core skill in Anatomy and Physiology I. If you can follow the right atrioventricular valve, you can also explain why the heart needs valves at all and how pressure changes create one-way movement. It also connects directly to heart sounds and valve disorders. When a valve does not close properly, blood can move backward, which is called regurgitation. On a lab practical, diagram, or case question, you may be asked to identify where the leak happens and predict what direction blood moves. The right atrioventricular valve also sets up the next step in the pathway to the lungs. Blood passes from the right atrium to the right ventricle, then moves through the pulmonary valve. That sequence helps you keep the right side of the heart separate from the left side and avoid mixing up the chambers and valves. ## Connections ### Right Ventricle The right atrioventricular valve empties into the right ventricle, so the two structures are studied together. The valve opens when the right atrium pushes blood forward, then closes as the right ventricle contracts. If you know what the ventricle is doing, you can explain why the valve must close at that moment. ### [Pulmonary Valve](/anatomy-physiology/key-terms/pulmonary-valve) These two valves work in sequence on the right side of the heart. The right atrioventricular valve controls flow from the atrium to the ventricle, while the pulmonary valve controls flow from the ventricle into the pulmonary trunk. Students often mix them up on diagrams, so it helps to track the path of blood step by step. ### Tricuspid Regurgitation This condition happens when the right atrioventricular valve does not close tightly and blood leaks backward into the right atrium. In class, it may show up in a pathology discussion, a patient case, or a sound-based heart exam question. It is the dysfunction version of the normal valve movement. ### [ADH (Antidiuretic Hormone)](/anatomy-physiology/key-terms/adh) ADH is not part of the heart valve itself, but it connects to the same body-wide homeostasis ideas in Anatomy and Physiology I. ADH changes how much water the kidneys retain, which affects blood volume and therefore circulatory pressure. That helps link endocrine control to cardiovascular function. ## On the AP Exam A quiz item might show a heart diagram and ask you to identify the valve between the right atrium and right ventricle, or to trace what happens during ventricular contraction. You may also get a question about blood flow order, where you need to place the valve between the right atrium and the pulmonary valve. In a lab practical, you might point to the cusps on a model heart or explain why the valve closes when pressure in the right ventricle rises. If a case mentions regurgitation, you should connect that to backward flow into the atrium. ## Key Takeaways - The right atrioventricular valve is the tricuspid valve between the right atrium and right ventricle. - It opens to let blood move forward and closes to prevent backflow when the right ventricle contracts. - Its three cusps are supported by chordae tendineae and papillary muscles, which keep it from flipping backward. - It works before the pulmonary valve in the path of blood to the lungs. - If the valve fails to close tightly, blood can leak backward into the right atrium. ## FAQs ### What is the right atrioventricular valve in Anatomy and Physiology I? It is the tricuspid valve between the right atrium and right ventricle. Its job is to let blood move into the right ventricle and stop it from flowing backward when the ventricle contracts. ### Why is the right atrioventricular valve called the tricuspid valve? It is called tricuspid because it has three cusps, or flaps. Those cusps close together during ventricular contraction to seal the opening between the right atrium and right ventricle. ### What happens if the right atrioventricular valve does not close properly? Blood can leak backward into the right atrium, which is called regurgitation. That means less efficient forward flow into the pulmonary circulation, and it may be mentioned in pathology or heart sound questions. ### How do I identify the right atrioventricular valve on a heart diagram? Look for the valve between the right atrium and right ventricle on the heart's anatomical right side. It sits before the pulmonary valve in the flow of blood toward the lungs. ## Related Study Guides - [17.3 The Pituitary Gland and Hypothalamus ](/anatomy-physiology/unit-17/3-pituitary-gland-hypothalamus/study-guide/LBytUT31lFYSlVgF) - [17.1 An Overview of the Endocrine System ](/anatomy-physiology/unit-17/1-overview-endocrine-system/study-guide/pddJhvIvHr0hQlWa) ## About This Document Canonical Fiveable pages are available as Markdown at the same path plus `.md`. - [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns - [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing - [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`) - [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`) ## Structured Data ```json {"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/anatomy-physiology/key-terms/right-atrioventricular-valve#resource","name":"Right Atrioventricular Valve | Anatomy I","url":"https://fiveable.me/anatomy-physiology/key-terms/right-atrioventricular-valve","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/anatomy-physiology/key-terms/right-atrioventricular-valve#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-07-03T02:20:41.765Z","isPartOf":{"@type":"Collection","name":"Anatomy and Physiology I Key Terms","url":"https://fiveable.me/anatomy-physiology/key-terms"},"author":{"@type":"Organization","@id":"https://fiveable.me/editorial#content-team","name":"Fiveable Content Team","url":"https://fiveable.me/editorial","parentOrganization":{"@id":"https://fiveable.me/#organization"},"member":[{"@type":"Person","name":"Amanda DoAmaral","sameAs":["https://www.linkedin.com/in/adoamaral"]},{"@type":"Person","name":"Becky Bahr","sameAs":["https://www.linkedin.com/in/becky-bahr-b52743132"]}]},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/anatomy-physiology/key-terms/right-atrioventricular-valve#term","name":"right atrioventricular valve","description":"The right atrioventricular valve is the tricuspid valve between the right atrium and right ventricle. 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