Why is blood red?

Have you ever thought of why your blood is not green? or perhaps blue?


It is because out red blood cells contain what is called Hemoglobin. It makes up 97% of the red blood cell. Essentially, it is the “red” in the red blood cell.


Hemoglobin is very essential in transporting Oxygen from the lungs to the tissues of the body.  If you do not have enough Hemoglobin,  you will not have enough oxygen.

Here is a short video that explains all you need to know about the structure of Hemoglobin to pass A & P II

Here are other resources to help you master Blood A & P II

Do you have any questions on Blood A & P? If you do, post it below and we will answer it ASAP!



7 Comments Add yours

  1. Anonymous says:

    By looking at a blood sample, how do you know what type of blood group it belongs in?

    Liked by 1 person

    1. Hey! Thank you for your question. We have posted the response. Find it here at https://fsulearninghub.wordpress.com/2017/02/10/student-question-4-by-looking-at-a-blood-sample-how-do-you-know-what-type-of-blood-group-it-belongs-in/

      If you have any more questions, post them in the comment section below and we would respond ASAP!


  2. carolineb20 says:

    Can you describe the process of removing old erythrocytes from the blood and which parts of hemoglobin are re-used by the body?

    Liked by 1 person

    1. Hey!
      Thank you for your question. We have posted the reply at https://fsulearninghub.wordpress.com/2017/02/17/students-question-6can-you-describe-the-process-of-removing-old-erythrocytes-from-the-blood-and-which-parts-of-hemoglobin-are-re-used-by-the-body/
      Remember, you can ask as many questions as you want to, especially as your first exam is approaching. We will always be here to help!!


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