The Chemical in Red Blood Cells

Hemoglobin is a chemical found in red blood cells, and it is red in color.
Hemoglobin is what gives red blood cells the ability to carry oxygen and carbon dioxide.

carry oxygen and carbon dioxide

20170509 Hemoglobin
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Facts on hemoglobin:
(1) It is a type of protein.
(2) It is red in color.
(3) It is also why your red blood cells (and your blood) look red.
(4) It contains iron.
(5) It can loosely bond with oxygen and carbon dioxide, which is how it helps red blood cells carry these gases.

Next Generation Science Standards:

MS-LS1-3 Use argument supported by evidence for how the body is a system of interacting subsystems composed of groups of cells.

HS-LS1-2 Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

HS-LS1-3 Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.

What Science Does this Comic Teach?

Unit: Anatomy

⇒Chapter: Circulatory System

⇒Topic: Hemoglobin

Additional Information


Protein is a type of organic molecule, and it consists of amino acids.

Oxygen (O2)

Most organisms need oxygen to survive–including humans.  Without oxygen, our tissues will die in a matter of minutes.  We breathe in oxygen.

Carbon Dioxide (CO2)

To animals, carbon dioxide is a waste, and it must be removed from the body.  However, plants use this gas to conduct photosynthesis.

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