How does three chambers of heart help the amphibians?

  • Thread starter no idea
  • Start date
93
0
it seems that these kinds of animals can prevent blood going throught the lung (pulmonary vein,artey)Can anyone clarify it plz?
 
508
1
Oxygenated blood returning from the lungs (into the left atrium) and deoxygenated blood returning from the body (into the right atrium) get mixed in the single ventricle, the ventricle then pumps part of this blood to the lungs and part to the rest of the body. This has the effect that the body will not get blood satured with oxygen but it is good enough even if it is less efficient than a four-chambered heart.
 

DocToxyn

Science Advisor
424
0
The fact that these are cold-blooded animals and are not expending a lot of energy in heat production probably factors into this. Thus, reptiles* and amphibians can survive with a less efficient cardiac design. They are also able to shut off pulmonary artery flow to divert blood to the skin for cutaneous respiration during diving which may also compensate for a less efficient heart.

*The crocodilians are the exception to this design in the cold-blooded realm and have a four-chambered heart. However they are also capable of shunting pulmonary blood flow while diving. This anatomical setup is believed to be the most complex cardiac design in any vertebrate.
 
208
0
I guess this just goes to show that evolution is very thirfty. You only get what you proved (to nature) to need and not anymore.
 

Related Threads for: How does three chambers of heart help the amphibians?

Replies
2
Views
18K
Replies
10
Views
12K
  • Posted
Replies
3
Views
2K
  • Posted
Replies
3
Views
2K
Replies
6
Views
23K
Replies
2
Views
2K
Replies
1
Views
4K
  • Posted
Replies
3
Views
2K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top