To understand why octopus blood is blue, we need to first understand why our blood is red. The blood of most vertebrates (animals containing a backbone..ie: Humans, dogs, birds, reptiles, etc...) is red because our blood contains a protein called hemoglobin. Hemoglobin is the molecule responsible for carrying oxygen. Hemoglobin is located in red blood cells. When red blood cells enter the lungs, hemoglobin binds oxygen molecules, and as the red blood cells flow throughout our bodies, hemoglobin releases the oxygen to our cells, nourishing them. The way that this is done is through the use of Iron. Iron (specifically Iron III) is an ideal molecule for binding oxygen. When iron binds oxygen it turns RED. This is why our blood is red; because the hemoglobin within our red blood cells contains iron, which turns red when bound to oxygen. When hemoglobin is not bound to oxygen, our blood is blue as well. Go ahead, look at one of your veins. Veins carry oxygen-depleted blood back to the lungs and heart. Until this blood contacts more oxygen, it remains blue. Now to answer the question: why is octopus blood blue? In short, Octopus blood lacks hemoglobin, and hence lacks iron. Oxygen transfer is accomplished by another (less efficient) protein known as hemocyanin. This protein, as well as other molecules in the octopus' blood give it the characteristic blue color.
Because the blood pigment is hemocyanin, a copper based pigment, which gives it a blue color.
squid blood contains a copper-containing compound called haemocyanin
Horseshoe crabs
pinkish green
Both squids and octopuses have blue blood.Their blood is this colour because they use an oxygen-carrying molecule in their blood that contains copper.
Incorrect AnswerNo, instead they all have blue blood. This is because they have a certain molecule inside the blood containing copper. Most organisms have blue blood. Humans have blue blood!AnswerActually, Squids have red blood. Octopuses have blue blood. The answer above is incorrect. But it is true that humans have blue blood that turns red when it is exposed to oxygen.
Yes their blood is red
Yes, they do.
No they do not.
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Since squids do not have haemoglobin they use haemocyanin to bind and transport oxygen throughout their body.
Squids can come in many different colours; and yes red is one of the colours they can be. Squids can also be red, purple, blue, and a few others. The colour of squids can depend on what they eat or where they live (there are other factors of the colours as well).
Squids do not actually have blood. They have a substitute for blood, called hemolymph. It is just a fluid with oxygen and other nutrients in it.
squid have 3 hearts, they have one that pumps blood to either side of their gills and these two hearts surround the main heart (systemic heart) that pumps blood to the rest of the squids body
iridophores