BIOS 255 Week 2 Discussion; The Heart

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Contributor

Chandler Hallow

Category

Biosciences

Course

BIOS 255 Anatomy And Physiology III With Lab

Institute

Chamberlain

Pages

7

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Week 2 The Heart Your Name Chamberlain University College of Nursing BIOS 255: Anatomy & Physiology III with Lab Ojeen Simman, M.D. DateIdentify the chambers of the heart and their functions, the associated valves, and the names and general route of their associated great vessels. The heart has 4 chambers, 2 upper chambers (atria) and 2 lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood. Valves are actually flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle. Normal valves have 3 flaps (leaflets), except the mitral valve (bicuspid valve). It only has 2 flaps. The 4 heart valves are: Tricuspid valve. This valve is located between the right atrium and the right ventricle. Pulmonary valve. The pulmonary valve is located between the right ventricle and the pulmonary artery. Mitral valve. (bicuspid valve). This valve is located between the left atrium and the left ventricle. It has only 2 leaflets. Aortic valve. The aortic valve is located between the left ventricle and the aorta. The 4 heart chambers are: Chamber Role Mechanism Right atrium Receives deoxygenated blood from the vena cavae (superior & inferior vena cava) and coronary sinus and empties it into the right ventricle via the tricuspid valve (right atrioventricular valve) While the left ventricle is relaxing, the right ventricle also relaxes. This causes the pulmonary valve to close and the tricuspid valve to open. This lets deoxygenated blood flow into the right ventricle that was returned to the right atrium from the body. Right ventricle Pumps deoxygenated blood into the pulmonary trunk via the pulmonary valve. When the left ventricle contracts, the right ventricle also contracts. This causes the pulmonary valve to open and the tricuspid valve to close. Deoxygenated blood flows out from the right ventricle

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