NEET BIOLOGY

Detailed explanation-1: -Snails, spiders and octopi have something in common-they all have blue blood! We’re not talking in the sense of royalty, these creatures literally have blue blood. So why is their blood blue and ours red? One of the purposes of blood is to carry oxygen around the body.

Detailed explanation-2: -Can you guess what animals might have blue blood? Lobsters, crabs, pillbugs, shrimp, octopus, crayfish, scallops, barnacles, snails, small worms (except earthworms), clams, squid, slugs, mussels, horseshoe crabs, most spiders.

Detailed explanation-3: -Crustaceans, squid, and octopuses have a blood color of blue.

Detailed explanation-4: -Human blood is red because hemoglobin, which transports oxygen and is carried in the blood, is iron-rich and red in colour. Blue blood is found in octopuses and horseshoe crabs. This is due to the fact that hemocyanin, the protein that transports oxygen in their blood, is blue.

Detailed explanation-5: -But what many of us picture as blood-red and full of iron, for instance-differs depending on the species. For instance, some crustaceans, squid, and octopuses have blue blood due to the oxygen-transporting protein hemocyanin, which contains copper, says Stephen Palumbi, a marine biologist at Stanford University.