2017年6月7日 · The pulmonary valve ensures unidirectional flow of de-oxygenated blood to the lungs; the aortic valve ensures unidirectional flow of oxygenated blood to the rest of the body. Valves ensure unidirectional flow of blood. Heart valves, in particular, are required to keep the flow of blood unidirectional and to prevent reversal of flow. The pulmonary valve lies between …

2017年12月31日 · The pulmonary veins do not have valves because the pressure exerted by the heart is strong enough to keep the blood flowing in one direction. > There are four pulmonary veins, two from each lung. The left and right superior and inferior pulmonary veins carry oxygenated blood from the lungs back to the left atrium of the heart. They differ from other …

2017年4月3日 · Once a volume of blood has passed through the pulmonary valve, it enters the pulmonary trunk which then bifurcates (splits) into the right and left pulmonary arteries. The right pulmonary artery which travels horizontally to the right lung, whilst the left pulmonary artery is forced to take a more oblique route in an upward direction because of ...

2017年9月13日 · Let us examine definition of artery: It is a blood vessel with elastic wall, that carries blood away from the pumping heart, under high pressure. Pulmonary artery takes away blood from heart to lungs. It also has elastic wall to counter high blood pressure. Pulmonary artery arises from right ventricle of heart. Right ventricle in turn receives blood from right atrium. …

2016年6月14日 · Atrioventricular(AV) valve on the right side of the heart is Tricuspid valve. Anatomy & Physiology ...

2016年1月30日 · Veins transport blood towards the heart, while arteries transport blood away from the heart. > All veins in the body transport deoxygenated blood to the heart except for the pulmonary veins. Recall that in internal respiration, oxygen diffuses from the alveoli to the deoxygenated blood. When this happens, the blood then becomes oxygenated. The function …

2016年3月23日 · blood enters the right atrium from the inferior vena cava and the superior vena cava.(they collect the de-oxygenated blood from the lower and upper part of the body respectively). They pour all the blood in the right atrium. from the right atrium the blood is poured into the right ventricle through the tricuspid valve. The right ventricle pumps the blood into the …

2016年2月1日 · See explanation. Pulmonary circulation refers to the circulation of blood in which deoxygenated blood is pumped from the heart to the lungs and oxygenated blood is returned to back to the heart. Pulmonary circulation only occurs between the heart and the lungs. Systemic circulation refers to the circulation of blood in which oxygenated blood is pumped from the …

2016年2月12日 · It provides the cells with oxygen In cellular respiration, oxygen and glucose react to produce water and carbon dioxide. Oxygen is essential for aerobic respiration (the main type of respiration in humans). "carbon dioxide" + "water" + "energy" -> "glucose" + "oxygen">6"CO"_2 + 6"H"_2"O" -> "C"_6"H"_12"O"_6 + 6"O"_2 The respiratory system supplies the cells with …

2016年2月3日 · The main function of the valves in veins is to prevent back flow of blood. Blood in the arteries, after being pumped by the heart, are under much higher pressure than blood in veins so there is no need for valves in arteries to prevent back flow. Blood in veins is under much lower pressure as it is returning to the heart from the various organs and tissues and so has a risk of …