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human heart

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human heart

Postby Unit_01 » Sun Oct 22, 2006 7:42 am

hey guys,, i am doing a assignment and need help with a few questions please.
My questions are:
1. The muscular walls of the atria and ventricles differ considerably in elasticity and thickness. Why are the walls different in thickness?

2. compare thicknesses of the walls of the 2 ventricles ande xplain the differences.
please help me fellow members. your help will be highly appreciated.
thanks in advance
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Postby Amrik » Sun Oct 22, 2006 8:17 am

1. I Am Not Really Sure..... It maybe because atria does not have to pump blood anywhere but just to let me flow down into the ventricles when the tri/bi cuspid valves contracts...atria has more elasticity than ventricles but ventricles have thick walls....because they have to pump blood to the lungs/body with high pressure. Thus, to withstand the pressure they have thick walls

2. The walls of the left ventricle is more thick because the left ventricle has to pump blood to the whole body, to withstand the high pressure used to pump the blood the walls are thick. Whereas, the right ventricle has to pump blood to the lungs which is not so far...the pressure used is not as high as the pressure used by the left ventricles....

PS. Wait For Other To Answer too....maybe i am wrong!
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Postby kjle » Sun Oct 22, 2006 9:12 am

don't count yourself out so quickly amrik
from what i learned in biology this is true, the atria don't have to pump blood so they don't need really thick muscular walls, the ventricles pump blood, so a much stronger contraction must be made for high pressure, and what amrik said about the left ventricle being thicker to pump blood though the whole body
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Postby cracked_doc » Sun Oct 22, 2006 9:50 am

yepp.... thts how it goes.. the left ventricle has to pump blood all round the body thru the aorta therefore its walls are thicker and more muscular... the right one has to pump deoxygenated blood to the lungs through the pulmonary artery... and because the lungs are relatively near, its walls do not need to exert a high pressure, therefore they are thinner and less muscular..
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Postby Amrik » Sun Oct 22, 2006 10:26 am

i was not sure only about the 1.! hehe...never saw that question before...but for the 2. i have done that in my test around 10 times...but i am happy iwas correct!
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Postby Unit_01 » Wed Oct 25, 2006 9:53 am

thankyou so much guys!!! u have helped me so much thanks man. I have a couple more q's left if u dont mind helpin me?

1. the veins that enter the atria: describe how their thickness and elasticity compare with those of the arteries that leave the ventricles/

2. where do coronary arteries from the aorta lead to?

3. advantages of these arteries being first to recieve fully oxygenated blood just after it leaves the heart.

4. Why mammalian circulatory system is described as a double circulation system?

that it for now guys. Your help is highly appreciated.
thnakyou very much
thanks in advance
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Postby Amrik » Wed Oct 25, 2006 10:55 am

1. I Really Dont Know About iIt At All

2. They lead to the heart muscles

3. They will have lots of oxygen and digested food substances (Glucose, fatty acids, amino acid)

4. Because..They really do have double circulation system...First circulation system is from heart to lungs (systemetic circulation...if i m not rong), Second.....From Heart To Whole Body (Pulmonary Circulation...if i m not rong)
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