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What happen when the right atrium contracts?
At the beginning of the cardiac cycle after they receive an action potential from they synoatrial node. After a short pause, they produce the 'lubb' sound as the atrioventricular valves close to prevent back flow of blood.
List in order the arteries as they leave the heart?
Since both sides of the heart contract at the same time, the right ventricle pumps blood into the pulmonary trunk, and the left ventricle pumps blood into the Aorta.
How does the heart pumping?
Magically.
Can blood go backwards from the right ventricle to the right atrium?
That is partly true, but thinking of atrial function only in this way is misleading. The right atrium has a job that is subtle and very important. The atria do not have valves at the 'intake' end, so there is not a push in the same way that ventricles push blood. When the right atrium is in systole, or contracting, the contraction is not strong; if it were it would cause back flow to the veins feeding the right heart. While the atrium contracts, the relaxing right ventricle is taking in blood from the atrium. But at the same time, blood is still flowing directly from the veins right into the right ventricle! Then when the ventricle is contracting and sending blood to the lungs, blood flow can continue unimpeded into the relaxing atrium. So the atrium's job is really to prevent inertia of blood during the beating cycle; it helps the blood to keep moving without coming to a jolting stop during each beat.
What is the use of artioventricular valves?
Atrioventricular valves are two in number. Mitral valve is between the left atrium (upper chamber) and left ventricle (lower chamber). Tricuspid valve is between the right atrium (upper chamebr) and right ventricle (lower chamber). Mitral valve closes when the left ventricle contracts, to prevent back flow of blood into the left atrium. Tricuspid valve closes when the right ventricle contracts. Hence the blood from the ventricles are able to go out of the heart into the blood vessels during ventricular contraction. Mitral and tricuspid valves open when the ventricles relax, permitting blood to enter the ventricles from the atria. This blood is pumped out when the ventricles contracts next time.
How do valves work?
A rotary valve, at the ones I'm familiar with, is typically used to move solid materials from a hopper. Basically the valve is designed with a paddle wheel which is shaft-mounted and driven by a motor. The rotary valve is similar to a revolving door: the paddles or blades form an airtight seal with the housing; the motor slowly moves the blades to allow the solids to discharge from the hopper. I know how trumpet rotary valves work. Just tilt the trumpet sideways so the rotary valves face upwards and play.
Do all cardiac muscle fibers all contract at the same time?
No. The heart muscle contracts in sections, first the top (atrium) then the bottom (ventricle). But when it is working properly, the heart muscle fibers contract together in large groups.
Blood leaves the right ventricle then passes through a valve and enters what blood vessel?
through seminular valve at the time of ventricle contaraction blood from right ventricle is pumped to lungs.
Do the right and left side of the heart pump blood at the same time?
The right and left ventricles of the heart contract, or pump blood, at the same time. The right ventricle pumps blood to the lungs, and the left ventricle pumps blood to the body.
What chambers of the heart receives blood from the body?
Right atrium then right ventricle.
Do the heart valves open at the same time?
>YesNo 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.htmlWell 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.
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 :)
