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Frog heart

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Frog heart

Postby Aerlinn » Tue Nov 15, 2005 9:25 am

This question: The heart of a frog has two atria as in mammals but only one ventricle, into which both atria drain. Otherwise both circulatory systems of a frog and mammal are the same. Because of the structure of the frog's heart:
A The difference between the oxygen concentration in arterial blood and the oxygen concentration in venous blood would be the same in frogs and mammals
B the difference between the carbon dioxide concentration in arterial blood and the carbon dioxide concentration in venous blood would be greater in frogs than mammals.
C blood moving along the pulmonary arteries of a frog would be partly oxygenated, whereas blood in the pulmonary arteries of mammals is deoxygenated blood.
D All oxygenated blood entering the frog's ventricle would come from the right atrium, as in mammals.

Can someone help, as well as give an explanation?
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Postby sdekivit » Tue Nov 15, 2005 9:48 am

frogs also contain a respiratory system through the integumentary system ;)
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Postby Aerlinn » Tue Nov 15, 2005 10:00 am

Yup, but it's a multiple choice question. Only one of the answers are right, and i dont know which :S
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Postby Dr.Stein » Tue Nov 15, 2005 2:06 pm

Read this and then draw a conclusion and answer your question by yourselves ;)

The frog heart has three chambers: two atria and a single ventricle.
* The atrium receives deoxygenated blood from the blood vessels (veins) that drain the various organs of the body.
* The left atrium receives oxygenated blood from the lungs and skin (which also serves as a gas exchange organ in most amphibians).
* Both atria empty into the single ventricle.
* While this might appear to waste the opportunity to keep oxygenated and deoxygenated bloods separate, the ventricle is divided into narrow chambers that reduce the mixing of the two blood.
* So when the ventricle contracts,
---> oxygenated blood from the left atrium is sent, relatively pure, into the carotid arteries taking blood to the head (and brain);
---> deoxygenated blood from the right atrium is sent, relatively pure, to the pulmocutaneous arteries taking blood to the skin and lungs where fresh oxygen can be picked up.
---> only the blood passing into the aortic arches has been thoroughly mixed, but even so it contains enough oxygen to supply the needs of the rest of the body.
* Note, that in contrast to the fish, both the gas exchange organs and the interior tissues of the body get their blood under full pressure.
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Postby MrMistery » Tue Nov 15, 2005 7:29 pm

i wrote the explanation to this question some time ago. it would have been much easier to search the forum. my advice is to try this next time so you won't have to wait until someone answers
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Postby Aerlinn » Wed Nov 16, 2005 5:02 am

From that, I'm thinking it's either A or B... :S But arterial blood and venous blood, what are those?
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Postby MrMistery » Wed Nov 16, 2005 6:22 pm

arterial blood- blood that travels through arteries and has oxigenated blood
venous blood- travels through veins, has blood with CO2
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Postby sdekivit » Wed Nov 16, 2005 9:49 pm

MrMistery wrote:arterial blood- blood that travels through arteries and has oxigenated blood
venous blood- travels through veins, has blood with CO2


the mistake everyone makes ;)

--> arteries move blood away from the heart, while veins move it towards the heart.

--> the embryonic arteries and pulmonary arteries contain O2-poor blood as an exception.
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Postby MrMistery » Wed Nov 16, 2005 9:55 pm

yeah, but in my anatomy book it is said "As an exception, the pulmonary artery contains venous blood and the pulmonary venes contain arterial blood"
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Postby Aerlinn » Wed Nov 16, 2005 11:45 pm

Okay, I think I get you... But still undecided as to whether its A or B
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Postby Dr.Stein » Fri Nov 25, 2005 7:20 am

MrMistery wrote:yeah, but in my anatomy book it is said "As an exception, the pulmonary artery contains venous blood and the pulmonary venes contain arterial blood"

I do not like this statement :? I agreed with sdekivit.
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Postby MrMistery » Fri Nov 25, 2005 9:32 pm

Well, as i said before, i didn't write the book, i just read it. Maybe the info is wrong. I will do a little research if i have time tomorrow or these days... Oh, and if i remember...
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