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The normal heart sounds heard through a stethoscope are caused by the contractions of the ventricles?
Normal heart sounds (often called lub-dub) are caused by the pressure changes in the ventricles closing the various heart valves. The first sound, lub, is caused by the closing of the atrioventricular valves after the ventricles have filled with blood and as the ventricles begin to contract. The second sound, dub, is caused by the closing of the semilunar valves as the ventricles relax after pushing blood forward.
What is caused by rapidly expanding and contracting air masses?
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What are caused by the uterus contracting to expel its lining?
Cramps are caused by the uterus to expel its lining.
What caused by the uterus contracting to expel its lining?
Cramps are caused by the uterus to expel its lining.
What are heart beats caused by?
The 'lub' is caused from turbulence of the blood in the ventricles once they have contacted. The 'dub' is the backflow of blood against the semi-lunar valves in the pulmonary artery and aorta once it has been squeezed out by the ventricles.
It is caused by rapidly expanding and contracting air mass?
thunder
What is the Lub-Dub sound?
In the lub-dub version of heart sound, dub is caused by the back rush of blood against a closed aortic or pulmonary valve.
The alternative expansion and contraction of the artery walls caused by the contraction and relaxation of the ventricles?
Pulse
Why dowe get hiccups?
Hiccups are caused by the diaphragm contracting suddenly and compressing the lungs.
What precautionary measures are taken there to minimize the damage caused by the tsunami?
what precautionary measures are taken to minimize the damage caused by the tsunami
What causes decreased preload?
Preload is caused by decreased blood volume in ventricles. Therefore, decreased preload directly caused by bleeding, polyuria, dehydration.
What causes a QRS wave?
A QRS wave is caused by the depolarization of the ventricles of the heart, which leads to the contraction of the ventricles and the pumping of blood out of the heart. The QRS complex represents the electrical activity associated with this depolarization.
