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When the heart contracts it produces a wave of fluid pressure in the?
arteries
What makes heart valves open and close?
Valves in the heart close (or open) due to pressure changes in the 4 chambers of the heart. When blood flows into the heart through the pulmonary vein (oxygenated) the heart is in diastole so both the left atrium and ventricle fill. At this point, the bicuspid valve between the chambers is open. When the left atrium becomes full of blood, stretch receptors trigger a response from the SA node - this leads to a contraction of the left atrium (bicuspid valve forced open by pressure). The pressure then exerted from the left ventricle on the left atrium causes the valve to close. This prevents back-flow into the left atrium. When the left ventricle is full, the AV node sends an impulse down the Bundle of His, and to the Prukinje fibres. The left ventricle is subsequently "squeezed" causing blood to flow up the aorta and out to the body. When the heart is contracting like this it is in Systole. Similarly, valves in the aorta close due to the pressure of the blood (caused by gravity). This, again, prevents back-flow in the heart. A similar chain of events occurs in the right side of the heart.
What coures make green yellow and blue?
Mixing the colours yellow and blue produces green. Mixing green to green makes green, but the resulting green will be different from the two greens that entered the mix (assuming they were not identical).
What is passive hanging?
A method of suicide that has the victim sitting or kneeling and leaning forward. They can EASILY stand up or move and stop the process because they are not "hanging". However, pressure from the "object" on the carotid artery and against the throat produces dizziness and low blood pressure so that they "pass-out" between 10 and 50 seconds and soon die. The method of death was learned by teens who heard of the "Choking Game" and discovered this method could be taken to another level.
Which type pf seismic wave produces the most severe ground movements?
surface waves produces the most severe ground movement because its on the surface of the earth
What is a Piezoelectric gauges?
An instrument used to measure blast pressures resulting from explosions and pressures created in firearms, using a piezoelectric substance that produces a voltage when under pressure.
Why are sound waves are described as pressure waves?
Sound waves are described as pressure waves because they propagate by creating alternating regions of high and low pressure in the medium through which they travel. These pressure fluctuations result in the compression and rarefaction of the medium particles, which our ears perceive as sound. The intensity of sound is directly related to the amplitude of the pressure waves.
What type of pressure system is a tornado?
A tornado produces low pressure, but it is not a pressure system in and of itself.
If a sphygmomanometer were used would it result give the pressure of the heart?
A sphygmomanometer is used to measure blood pressure.
Will the boiling point of water differ different with noon temperature?
Different places have different elevation, and different elevations have different air pressure. It is the ambient air pressure which affects the boiling point of water. Air presses down on water, making it harder for the water to form bubbles. Less pressure produces a lower boiling point. More pressure produces a higher boiling point.
How is wind obtained?
Wind is created by the movement of air in the Earth's atmosphere, primarily driven by differences in temperature and air pressure. When air masses with different temperatures and pressures come into contact, the resulting movement produces wind. Wind energy can be harnessed through wind turbines to generate electricity.
What produces amosphenic pressure?
Amosphenic pressure is generated by the amosphenic organ, which is a structure found in some beetles. This organ helps regulate gas exchange in the insect's respiratory system by creating pressure in the tracheal system to facilitate oxygen uptake and carbon dioxide release.
Does a tornado or a hurricane have the steepest pressure gradient?
Definitely a tornado. A hurricane produces a large pressure drop over a distance of hundreds of miles. A tornado produces a similar, possibly larger pressure drop over only a few hundred feet.
What kind of pressure does a tornado have?
Tornadoes produces low pressure.
Does cooler air make a high pressue area or a low pressure area?
Cold air becomes more dense, hence it produces higher pressure.
What method of heat transfer produces global circulation of air and water on earth?
The method of heat transfer that produces global circulation of air and water on Earth is convection. As the Sun heats the Earth, air and water at the equator become warmer and rise, creating low pressure. This rising air moves towards the poles, cools, and descends back down, creating high pressure. This circulation pattern drives the movement of air and water around the Earth.
What is caused by the collisions of air molecules around you that produces the force of an area?
atmospheric pressure
