Understanding Blood Colors

The video explains why human blood is red, focusing on the role of hemoglobin, an iron-rich protein in red blood cells that binds with oxygen to give blood its red color. It also highlights that not all animals have red blood; for example, octopuses and spiders have blue blood due to hemocyanin, a copper-containing protein, while some lizards have green blood due to biliverdin. The video concludes with a teaser for the next topic.

What component in human blood is primarily responsible for its red color?

• White blood cells

• Platelets

• Hemoglobin

• Plasma

Which protein is found in the blood of octopuses and gives it a blue color?

• Hemoglobin

• Myoglobin

• Hemocyanin

• Biliverdin

What metal is present in hemocyanin that contributes to the blue color of some animal blood?

• Iron

• Copper

• Zinc

• Magnesium

Which pigment is responsible for the green color of some lizards' blood?

• Hemoglobin

• Carotene

• Chlorophyll

• Biliverdin

Why do some animals have blood that is not red?

• They lack blood cells

• They have different proteins like hemocyanin

• Their blood is not oxygenated

• They have more plasma