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Atrioventricular (AV) valves open when the pressure in the atria exceeds the pressure in the ventricles. This pressure difference causes the valves to be pushed open from above, allowing blood to flow from the atria into the ventricles. Therefore, it is the pressure from above the AV valves that causes them to open.
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What happened to the heart?
Blood first enters the atria by the veins. The walls of the atria contract, pushing blood from the atria into the ventricles through the atrioventricular valves, which are open at that time. The semilunar valves are therefore closed, so that the ventricles can fill with blood. The walls of the ventricles then contract powerfully and the blood pressure rapidly rises inside them. This first causes the atrioventricular valves to close in order to prevent back-flow of blood to the atria and then causes the semilunar valves to open, allowing blood to be pumped out into the arteries. At the same time this is occurring, the atria start to refill with blood collected from the veins. The ventricles stop contracting and as pressure falls inside them the semilunar valves close, preventing back-flow of blood from the arteries to the ventricles. When the ventricular pressure drops below the atrial pressure, the atrioventricular valves open. Blood entering the atrium from the vains then flows on to start filling the ventricles once again.
When an airplane is flying how does the air pressure above a wing compare with that below the wing?
In flight, the air pressure above the wing is less than that below it.
What is the difference of pressure above and below the miniscus of water?
The pressure above the meniscus in water is lower than the pressure below it. This pressure difference results in the upward capillary action observed in narrow tubes containing water.
Is air pressure greater above the wing or below the wing?
Lower above, and greater below. That's what enables the wing to create lift.
Why is air pressure greater below the wing's surface?
It's not so much that the air pressure below a wing is greater as it is the pressure above it is less. The way a wing works, is the airfoil (shape of the wing) accelerates the air above the wing. Since the air is moving faster, it lowers the air pressure, resulting in a lower pressure above, and a higher(standard) pressure below, creating lift.
What is the main difference between the air below and above the wings of a plane in flight?
The main difference between the air below and above the wings of a plane in flight is the air pressure. The air below the wings has higher pressure, while the air above the wings has lower pressure. This pressure difference creates lift, allowing the plane to stay in the air.
Where is pressure greater 10 m below the surface of sea or 20 m below?
Pressure is greater at 20 m below the surface of the sea than at 10 m below due to the increase in water column above, causing an increase in hydrostatic pressure. The pressure at any point in a fluid is directly proportional to the depth of the fluid above that point.
What keeps blood flowing towards the heart in the largest veins?
gravity for those above your heart and valves for those below
Where the pressure is greater 10m above the surface of the sea 20m below the surface of the sea?
Pressure increases the deeper you sink beneath the surface of the sea. So 20 metres below the surface has more pressure than 10 metres above the surface.
What happens when air above an airplane wing is moving faster than air below an airplane wing?
When the air above an airplane wing moves faster than the air below it, a pressure difference is created. This pressure difference generates lift, as the higher pressure below the wing pushes the aircraft upward. This is known as Bernoulli's principle, where increased air speed above the wing results in decreased pressure and lift.
Why is the pressure at 14000 ft above sea level 0.69 ATM while the pressure at 14000 ft below sea level is 470 ATM?
The pressure at different altitudes depends on the weight of the air column above that point. At 14000 ft above sea level, there is less air above causing lower pressure (0.69 ATM). Conversely, at 14000 ft below sea level, there is more air above causing higher pressure (470 ATM).
Why does the air pressure above an airplane wing diff from the pressure below it?
The air pressure above the wing is lower because the air traveling faster over the curved top surface creates lower pressure compared to the slower-moving air below the wing. This pressure difference generates lift, allowing the airplane to fly.
