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02: (4 marks): What are two advantages of having four-chambered heart rather than a 2-chambered heart? Name two animals that have a 2 - chambered heant and 2 animal...

Question

02: (4 marks): What are two advantages of having four-chambered heart rather than a 2-chambered heart? Name two animals that have a 2 - chambered heant and 2 animals that have 4-chambered heart: These animals do not have to be ones you saw dissected:

02: (4 marks): What are two advantages of having four-chambered heart rather than a 2-chambered heart? Name two animals that have a 2 - chambered heant and 2 animals that have 4-chambered heart: These animals do not have to be ones you saw dissected:



Answers

What is one advantage of a four chambered heart over a three chambered heart?
a. Oxygenated blood carried by the right side of the heart is completely separated from the left side carrying deoxygenated blood, which assists in more efficient movement of oxygen around the body and aids in allowing the body to quickly move when needed.
b. A four-chambered heart keeps oxygenated and deoxygenated blood separated and has double circulation whereas a three-chambered heart has a single circulation. This assists in more efficient movement of oxygen around the body.
c. Oxygenated and deoxygenated blood are kept separate in a four-chambered heart, which assists in more efficient movement of carbon dioxide around the body.
d. Oxygenated and deoxygenated blood are kept separate in a four-chambered heart, which assists in more efficient movement of oxygen around the body and aids in allowing the body to move quickly when needed.

Mm. Okay, so prom 11 is asking about how the adaptation of the heart being split into four chambers is effective or how it helps for birds and mammals. Let's see four chambers where blood is pumped through one side and then goes through the other to be pumped systemically throughout the body. So the purpose of this four chambers is to separate oxygenated and deoxygenated blood and send it to him from the lungs to be oxygenated. So the benefit of this adaptation has increased complexity and efficiency for the organisms that haven't because blood can go in one side deoxygenated and comes out the other side oxygenated and the mixing of the blood doesn't occur. So the lungs can efficiently provide oxygen. Only two deoxygenated blood. You're not having oxygenated blood going through the hub through the lungs and overwhelming the system. The benefits are increased complexity and efficiency, as well as decreased overload on the lines.

Rivers like reptiles. Amphibians and fish get their body heat from the environment. They're called ecto thermic, meaning that they do get their body heat from the environment so they do not need to have a high metabolism. They don't need as much and they don't need to have quite as efficient of a circulatory system verb. It's like birds and mammals are what are called and all thermic, which means that they get their body heat primarily from their own metabolism. They need to have a very efficient circulatory system that actually separates oxygenated and deoxygenated blood completely. So they've evolved in these animals have evolved a four chambered heart. We have two ATIA and two ventricles. Mhm. The right side of the heart has primarily the oxygen of blood, and the great ventricle is going to pump blood out to the pulmonary circulation to pick up oxygen where the blood will then go back to the heart. And the left side of the heart is primarily felt with the oxygen in the blood, where blood is going to be pumped out to the body circulation, drop off oxygen for the buttons. And because we do not have mixing of oxygen and Jackson, that blood in the ventricular area, it is much more efficient

What are the evolutionary advantages of the closure perception? So if you close the septum you have complete separation of the pulmonary and systemic circuits? Why is this important? So one reason is you don't have no mixing of the oxygenated and the oxygenated blood. So this is good because the opportunity ability of president of the system will have more oxygen then if it were of always being mixed with the opportunity blood. So that's more efficient. Seconds is to do a blood pressure, blood pressure can be higher and the systemic circuit now it has to be low in the primary circuit to avoid damaging all of those delicate capillaries around the albion online. But now that the systemic circuit is separated from that, you are free to have high blood pressure in the systemic circuit. So those are the two main benefits of a double circulatory system. You know, have a higher degree of oxygenation of the blood and it's a much high pressure. So you're getting much higher flow of oxygen to the tissues. So that's why I have a bit more metabolically active organisms like mammals and birds have this closed system with a double circulatory system.

Hi, this is a short video about the circulatory system. Almost all animals have some type of circulatory system. There are two two general ways to describe the circulatory system. There are open circulatory systems and close circulatory systems. So an open circulatory system which you would find in an invertebrate, like an arthropod. So if this is a schematic diagram of a grasshopper, there is a heart large structure and the heart pushes blood a fluid that contains nutrients and auction through a tube. So the blood the heart does push the blood through a tube. However, there comes a point where the blood leaves the tube and just goes into the interstitial fluids and is able to then deliver the nutrients and the oxygen to the fluids and eventually the blood makes its way back into the system. But it's the system is open. The blood can can escape. Um In a closed circulatory system there is a heart. Some form of heart heart pumps blood and the blood leaves the heart inside vessels, arteries and the blood stays in those vessels. Even when it's in the capillary bed, it's still inside the capillaries and eventually makes its way back to the heart in the veins. And so in a closed circulatory system, the blood is always inside a structure, whether that's the heart or some sort of blood vessel. And I think the the key point that the chapter wants you to get is that all vertebrates, all vertebrates have a closed circulatory system. So in all vertebrates, the blood stays within the circulatory system. All right, see you next time.


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