Why is Blood Red?

The video explores the different colors of blood in various animals, explaining the molecules responsible for these colors. Horseshoe crabs have blue blood due to hemocyanin, which contains copper. Deep sea worms have pink blood because of the molecule hemorrhythrin. Human blood is red due to hemoglobin, which contains iron. Hemoglobin is the most efficient oxygen carrier, making red the most common blood color in the animal kingdom.

What molecule is responsible for the blue color of horseshoe crab blood?

• Hemoglobin

• Chlorophyll

• Hemocyanin

• Hemerythrin

Which of the following animals has blood that is not red?

• Horseshoe crabs

• Humans

• Dogs

• Cats

Which element is found in the molecule that gives deep sea worms' blood its pink color?

• None of the above

• Zinc

• Copper

• Iron

What is the name of the molecule that makes human blood red?

• Myoglobin

• Hemoglobin

• Hemerythrin

• Hemocyanin

Why is red the most common blood color in the animal kingdom?

• Because it contains copper

• Due to the efficiency of hemoglobin

• Due to the presence of chlorophyll

• Because it contains zinc