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According to if it were not for pulmonary surfactants you should expect the surface tension in a small alveolus to produce greater pressure than in a large one and air would flow from small to large?
Huntingp5
LaPlace's law
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∙ 15y ago
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What does the ductus arteriosus shunt blood away from?
It is present to shunt leftover blood from the pulmonary artery to the aorta because the pressure in the right fetal heart is higher than that in the left.
What phase of the cardiac cycle do ventricles contract?
The ventricular ejection phase is after the isovolumetric contraction phase. The ventricular ejection phase of the cardiac cycle is when the pressure in the ventricle becomes higher than the pressure in the aorta or pulmonary trunk (depending on which ventricle we are looking at). The high pressure in the ventricle will cause blood to be ejected from the ventricle into the aorta or pulmonary trunk. This is because blood moves from higher to lower pressure. Another way to consider the high pressure concept, is to picture the blood having a high kinetic energy (bouncing on the walls of the ventricle) and the blood molecules want to decrease their kinetic energy by moving to a less crowded area (such as the aorta or pulmonary trunk). Also, after the ventricular ejection phase, the blood will attempt to move back into the ventricle from the aorta or pulmonary trunk. This is inhibited by a semilunar valve closing (which is the dub sound in the common heartbeat sound, lub dub).
What is the contraindication of normal saline solution?
1- Sever Hypertension ( High Blood Pressure ) 2- Pulmonary Edema
Valves of the heart open and close due to?
Due to pressure changes in different chambers of the heart. For example, when the atria contract, the bicuspid and tricuspid valves open. They get closed, when the ventricles contract. When the ventricles contract the aortic and pulmonary valves open. Aortic and pulmonary valves close, when the ventricles relax.
How is the heart involved in pulmonary circulation?
Right side of the heart is involved in pulmonary circulation. This circulation is called, at times, as lesser circulation, as against the greater or systemic circulation. Blood that flows through the lesser and greater circulation is same in amount. But there is gross difference between the two. You have interstitial compartment in the systemic circulation. This is maintained through high blood pressure there. You do not have the same in pulmonary circulation. What you need here is simple blood flow, with out formation of the interstitial compartment. For that you have blood systolic blood pressure of about 25 mm of mercury. The blood pressure in the capillaries is about 15 mm of the mercury. The oncotic pressure of the blood proteins is about 22 mm of mercury. So very little fluid is leaked out to keep the alveoli wet. Some times in diseased condition more fluid is leaked out in the alveoli, to give rise to pulmonary oedema.
What does an elevated pulmonary wedge pressure indicate?
an elevated pulmonary wedge pressure indicate that the pressure in the left atrium is evevated .
What is an alveolar rupture?
An alveolar rapture refers to a situation where the alveolus raptures as a result of increased trans alveolar pressure with less pressure in the adjacent intestinal space. The rapture is dangerous because the amount of pulmonary congestion or obstruction that prevents the expansion of the lung is immeasurable, thereby leaving no criteria for safe pressures.
What develops within the pulmonary capillaries when the pressure increases?
pulmonary edema
What is pulmonary?
Pulmonary is a term that is relating to the lungs. When someone has a high blood pressure in the arteries of the lungs, they would have pulmonary hypertension.
Where would pressure be caused by stenosis of the mitral valve?
There will be higher pressure in the left atrium, when there is mitral stenosis. There will dilatation of the left atrium as well as there will hypertrophy of the left atrium. There will raise in the pulmonary veins. This will lead to pulmonary edema. This will eventually lead to high pressure in pulmonary arteries. That is called as pulmonary hypertension. The pressure in right ventricle will increase. Then the pressure in the right atrium will increase. Then the pressure in the systemic venous side will increase. This will lead to right sided heart failure.
Is the pulmonary circulation a high pressure circulation?
No
What is normal pressure for pulmonary artery?
25
Does blood in pulmonary vein flow with pressure?
yes if pressure is there only it is possible
Does the pulmonary artery have higher pressure than the pulmonary veins?
yes. because it pumps blood to the lungs.
How does high pulmonary capillary wedge pressure indicate high left atrial pressure?
There is little resistance between the pulmonary artery (where the catheter is placed in PCW) and the left atrium. This means that the pressure remains about constant.
What diagnosis means that the blood pressure in the pulmonary circulation is high?
Pulmonary hypertension, which is a serious illness and can lead to heart failure.
What would happen to the blood pressure in the pulmonary artery if more blood is drived to the lungs during exercise?
The pressure in the pulmonary artery increases during exercise if the cardiac output increases.
