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>Yes
No they do not.
Left ventricle contracts before the right. (From the correct anatomical position.)
That makes sense because the left ventricle has more work to do, systemic vs. pulmonary.
http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_electrical.html
Well guess what. This website is not entirely correct. Sometimes things are interpreted half right. What you want to focus on here from the EKG is the QRS complex. This is the depolarization and repolarization of the ventricles (not as they explained the firing of the left, then right ventricles). In general, you will say that the atria contract together and then the ventricles contract together. When you start splitting hairs, you can justify tiny differences in milliseconds, etc. Also, keep in mind that the left ventricle provides a much stronger contraction since it is sending out the blood to the systemic circuit, while the right goes out to the pulmonary circuit.
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Laono if it did you would be dead
Haha, funny, but true. If this question is asking, "do the atria contract at the same time, and then the ventricles contract after at the same time" - yes, that would be correct.
Some people split hairs here and talk about how the SA node is in the right atrium, and so it fires first, and that the left ventricle has a stronger, longer contraction so it has to fire first - but this is really splitting hairs. Remember these are electrical impulses, and are meant to fire the atria pretty much at the same time, then both ventricles at the same time. Incedently, the left ventricle is a stonger, thicker part of the heart due to the demand of sending blood into the systemic circuit.
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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 time does feral heart open?
well feral heart i a noroml animal it opens in an hour
How do you explain the function of the heart valves?
enforce a one way blood flow through the heart chambersthe valves prevent the blood from going backwards. they keep the blood flowing forwards! we just dissected a heart in science today so i know for sure thats what they do :)
When your heart goes bump bump is that one or to heart beats?
It really is lubb dupp and it is the sound of the 4 valves closing, two at a time. This occurs during one heart beat.
What time the museum its open and time close?
that depends on which museum, unless all museums open and close at the same time right?
