working on a paper and i need a digram or good description
2007-01-23 05:23:09 · 5 answers · asked by mainst2063 2 in Health ➔ Diseases & Conditions ➔ Heart Diseases
I'll assume you're talking about the atriaventricular and semi-lunar valves.
During atrial contraction/systole, blood is pumped into the ventricles, passing through the AV valves - tricuspid valves on the right side, bicuspid valves on the left. The valves point downwards into the ventricles and thus blood can be forced through it. These valves are held to the papillae of the heart via chordae tendinae which prevent them from flipping backwards into the atrium when blood in the ventricles push back against it.
During ventricular systole, blood in the right ventricle is pumped into the lungs and blood in the left ventricle is pumped into the aorta to the rest of the body. The blood passes through semi-lunar valves in both cases. Just as it is with the AV valves, the semi-lunar valves point towards the direction of blood flow, allowing the blood to push through them. The valves close when blood pushes backwards against it. Note that the semi-lunar valves have no chordae tendinae.
just search for 'heart diagram' in google images and you can find one that suits your paper nicely. one good one is http://www.nhf.org.nz/images/Heart%20diagram.jpg
2007-01-23 05:36:55 · answer #1 · answered by rfedrocks 3 · 0⤊ 0⤋
Blood is returned from the body via the Superior and Inferior Vena Cava, the superior returning the blood from above the heart (head and both arms) and the inferior from below the heart (the abdomen, and both legs). It, first, is returned to the Right Atrium. It passes through the Tricuspid Valve into the Right Ventricle (RV). The RV pumps the blood up through the Pulmonary Semilunar Valve, out the Pulmonary Trunk and to the Pulmonary Artery. The blood is then oxygenated by the pulmonary vasculature and returns to the heart via the Pulmonary Vein. The blood then flows though the Bicuspid Valve and into the Left Ventricle (LV). The LV pumps the blood past the aortic semilunar valve and out the Aorta. Hope this helps!
2016-05-24 01:14:15 · answer #2 · answered by ? 4 · 0⤊ 0⤋
The heart is a two sided pump the right atria fills with blood, and the tricuspid valve opens to actually let blood into the right ventricle- same with the left, the left atria fills with blood, the bicuspid valve opens, and the left vetricle fills-this happens at the same time-then the heart contracts ejecting the blood out of the heart-split second timing, becuase the heart is never empty.
Try the website www.Dr.Daledublinemergencyekg.com-
2007-01-23 05:38:34 · answer #3 · answered by Queen-o-the-Damned 3 · 0⤊ 0⤋
When pressure inside a chamber increases with filling of blood and reaches a certain value, the valve opens.
2007-01-23 05:54:19 · answer #4 · answered by yakkydoc 6 · 0⤊ 0⤋
By pumping the blood. Good to www.webmd.com to find a diagram or description. Do a search on heart. Good luck on your paper.
2007-01-23 05:28:11 · answer #5 · answered by be happier own a pitbull 6 · 0⤊ 0⤋