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Why does the ventricle have a thicker wall than the atrium?
The ventricle has to pump blood throughout the entire body, so it needs more muscle to do that.
Why is the wall of the left ventricle thicker and stronger than the atrium?
The left ventricle is thicker and stronger than the atrium because the left ventricle allows the arteries to rum through it. The arteries have thick cellular walls so they are bigger. The arteries do not run through the atrium.
Name the upper and lower chambers in the heart?
The lower (ventricles) are muscular and the valves can seal both openings. The upper (atria) are significantly weaker and are not sealed at the venous portal. Both left sides are thicker and stronger than the right (systemic pressure is much higher than pulmonary).
Why in a frogs heart does the ventricle have a thicker wall than in the atrium?
because the ventricle is carrying the blood toward the heartBecause the ventricle has to pump blood all over the body whereas the atrium only pumps it to the ventricle.
Why is the wall of the ventricle thicker and stronger than the atrium?
because it acts like a pumping part of the heart and has to pump the blood towards the lungs for oxygenation and left ventricle pumps the blood into aorta towards body parts......
What atrium do?
its location is in the upper heart chamber that is smaller than a ventricle.
What causes the pulmonary valve to close?
This is caused by a difference in pressure: higher pressure in the ventricle than in the atrium. As the atrium contraction finishes filling the ventricle with blood, the equalization of pressure allows the valve to fold back toward the atrium. The beginning of the contraction of the ventricular cardiac muscle causes higher pressure in the ventricle than the atrium, and this seals the valve shut. The valve opens again as the ventricle relaxes, and the atrium, filled again with blood, begins another contraction.
Does the right ventricle carry blood to the lungs?
Strictly speaking, anatomically, the right ventricle carries the blood from the right atrium to the pulmonary artery. The right ventricle contracts and propels the blood into the pulmonary artery at a higher pressure than that found in the right atrium.
When the heart muscle contract?
The heart muscle, myocardium, contracts when in the systolic phase, which is the part when the blood is being pushed out of the left ventricle into the aorta. The wall of the left ventricle tends to be much thicker than than the right ventricle because of the amount of of pressure it exerts the oxygen rich blood into the aorta. Seeing as though the heart is a muscle, if it is worked more, it gets stronger. The myocardium is an involuntary muscle that is controlled by both intrinsic and extrinsic factors.
Is the right ventricle muscular walls thicker than the left?
No. The wall of the left ventricle is much thicker. The left ventricle pumps blood through the systemic circuit, which travels though the entire body, excluding the lungs, returning to the right atrium. This requires overcoming the various resistance factors within the blood vessels including, but not limited to, distance traveled by the blood, gravity, and vessels with a narrow radius. To generate the necessary pressure, the muscle, or "wall" of the left ventricle, is much thicker, and therefore much stronger. The right ventricle pumps blood through the pulmonary circuit (to the lungs and back to the left atrium) which is much shorter and less complex, and therefore requires much less pressure and far less muscle.
Why does the right ventricle have a thicker muscle wall than the right atrium?
The right ventricle has to pump blood out of the heart and through the lungs, to return it to the left atrium. There is a lot of resistance to blood flow through the lung capillaries, so a thick musle wall is needed to generate enough pressure to overcome this resistance. The right atrium only has to pump blood through an open valve (the tricuspid valve) into the right ventricle. There is much less resistance to this flow of blood so much less muscle is needed. See: http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_anatomy.html
Is the pressure in the left atrium higher than right?
Yes, the pressure in the left atrium should be much higher than the pressure on the right side. The left atrium has to push blood into the left ventricle, which is much tougher and more muscular because it has to push blood throughout the entire body. The right atrium only has to fill the right ventricle, which is only pushing blood through the lungs.
