It depends on what kind of animal it is. If it is an amphibian, the red blood cells will have a nucleus. Human red blood cells do not have nuclei.
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Human blood contains different types of cells (red blood cells, white blood cells, and platelets) compared to animal blood. Additionally, human blood is rich in hemoglobin, which carries oxygen, while some animals have other proteins that serve a similar function. The composition and structure of blood components also vary between human and animal blood.
Cows have four stomachs.
Numerous differences can be seen between frog blood and human blood. Perhaps the most obvious is the oval shape of the frog erythrocytes rather than the biconcave discs of human blood. Moreover, the frog erythrocytes have a nucleus (here stained blue) whilst human erythrocytes do not. There is less difference in size between the erythrocytes and leucocytes than in human blood. There are no platelets in frog blood.
No, injecting animal blood into a human bloodstream would not cause them to turn into an animal. The human body would recognize the foreign blood cells as not its own and would likely trigger an immune response to remove them.
Yes. Most animals don't have an appendix. Apes and monkeys have an appendix like a human's (a long tube), and rabbits and a few species of other rodents have a more sack-like appendix. None of the other animals has one.
No, animal semen cannot impregnate female humans. Each species has reproductive barriers preventing the successful fertilization of eggs between different species.