Question for evolutionists

G

Grugore

Verified User
Ok. Your body has a circulatory system. This is used to move oxygen rich blood cells through every part of your body. Now, here's a question for you. A circulatory system is useless without blood. Also, blood has no reason to exist without one. So which came first? Blood or our circulatory system? The answer is neither. They were created at the same time. There is no other rational explanation.
 
That can't be true, your brain has clearly been deprived of oxygen for decades.

But also you can move oxygen through the body without one. Insects, mollusks, etc.
 
Grugore said:
Ok. Your body has a circulatory system. This is used to move oxygen rich blood cells through every part of your body. Now, here's a question for you. A circulatory system is useless without blood. Also, blood has no reason to exist without one. So which came first? Blood or our circulatory system? The answer is neither. They were created at the same time. There is no other rational explanation.
Click to expand...

Like a sponge, or only a few cell layers, such as the jellyfish? They do not have a circulatory system.
 
kudzu said:
Like a sponge, or only a few cell layers, such as the jellyfish? They do not have a circulatory system.
Click to expand...

Neither one of which is a warm-blooded mammal. The question still remains. Blood could not evolve without a circulatory system. A circulatory system could not evolve without blood to circulate. It's a catch-22. You cant have one without the other, and they could not evolve separately.
 
Grugore said:
Neither one of which is a warm-blooded mammal. The question still remains. Blood could not evolve without a circulatory system. A circulatory system could not evolve without blood to circulate. It's a catch-22. You cant have one without the other, and they could not evolve separately.
Click to expand...

Except for the circulatory systems that exist without blood that you just keep ignoring, because you likely failed high school biology.
 
Quetzalcoatl said:
That can't be true, your brain has clearly been deprived of oxygen for decades.

But also you can move oxygen through the body without one. Insects, mollusks, etc.
Click to expand...

If that is true, then why was there a need to develop a circulatory system? We're discussing warm-blooded mammals here. Not insects.
 
Quetzalcoatl said:
Except for the circulatory systems that exist without blood that you just keep ignoring, because you likely failed high school biology.
Click to expand...

Stay on topic. We're discussing warm-blooded mammals. Can you explain how our blood and circulatory system supposedly evolved? The question is still valid found species that don't use blood. A circulatory system needs something to circulate before it has any excuse to evolve.
 
Grugore said:
Ok. Your body has a circulatory system. This is used to move oxygen rich blood cells through every part of your body. Now, here's a question for you. A circulatory system is useless without blood. Also, blood has no reason to exist without one. So which came first? Blood or our circulatory system? The answer is neither. They were created at the same time. There is no other rational explanation.
Click to expand...

Circulatory System Variation in Animals
https://courses.lumenlearning.com/wm-biology2/chapter/circulatory-system-variation-in-animals/

The circulatory system varies from simple systems in invertebrates to more complex systems in vertebrates. The simplest animals, such as the sponges (Porifera) and rotifers (Rotifera), do not need a circulatory system because diffusion allows adequate exchange of water, nutrients, and waste, as well as dissolved gases, as shown in Figure 1a. Organisms that are more complex but still only have two layers of cells in their body plan, such as jellies (Cnidaria) and comb jellies (Ctenophora) also use diffusion through their epidermis and internally through the gastrovascular compartment. Both their internal and external tissues are bathed in an aqueous environment and exchange fluids by diffusion on both sides, as illustrated in Figure 1b. Exchange of fluids is assisted by the pulsing of the jellyfish body.

For more complex organisms, diffusion is not efficient for cycling gases, nutrients, and waste effectively through the body; therefore, more complex circulatory systems evolved. Most arthropods and many mollusks have open circulatory systems. In an open system, an elongated beating heart pushes the hemolymph through the body and muscle contractions help to move fluids. The larger more complex crustaceans, including lobsters, have developed arterial-like vessels to push blood through their bodies, and the most active mollusks, such as squids, have evolved a closed circulatory system and are able to move rapidly to catch prey. Closed circulatory systems are a characteristic of vertebrates; however, there are significant differences in the structure of the heart and the circulation of blood between the different vertebrate groups due to adaptation during evolution and associated differences in anatomy. Figures 2 and 3 illustrates the basic circulatory systems of some vertebrates: fish, amphibians, reptiles, and mammals.
Click to expand...
 
Grugore said:
Stay on topic. We're discussing warm-blooded mammals. Can you explain how our blood and circulatory system supposedly evolved? The question is still valid found species that don't use blood. A circulatory system needs something to circulate before it has any excuse to evolve.
Click to expand...

Learn to do internet searches pard.
 
Phantasmal said:
Organism evolved due to their environments, they mutated to adapt.
Click to expand...

Mutations arise randomly all the time, all enviroment does is result in selective pressure(s) upon randomly arising mutations in the population which may be beneficial/advantageous, detrimental/disadvantageous, both or indifferent. Semantics for you perhaps, but clearly we need to make this as simple as possible for the Grug.
 
Last edited:
Fentoine Lum said:
Mutations arise randomly all the time, all enviroment does is result in selective pressure(s) upon randomly arising mutations in the population with may be beneficial/advantageous, detrimental/disadvantageous, both or indifferent.
Click to expand...
Thanks, much better explanation.
 
Grugore said:
Stay on topic. We're discussing warm-blooded mammals. Can you explain how our blood and circulatory system supposedly evolved? The question is still valid found species that don't use blood. A circulatory system needs something to circulate before it has any excuse to evolve.
Click to expand...

It's progression. You don't start out with warm blooded animals because they appear after cold blooded ones, which appear after bloodless ones, and so on down the line.
 
You must log in or register to reply here.
Back
Top