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If someone has too many white blood cells, they may have an underlying condition, such as an infection or cancer…. For some types of blood tests, a person may need to fast beforehand.

In this article, learn about fasting for blood tests. Troponin levels in the blood are usually very low and only increase if the heart becomes damaged. Very high levels usually indicate that a person has….

What are coagulation disorders? Read on to learn more about these conditions, including the different types, causes, and treatments. Why is blood red? Written by Yella Hewings-Martin, Ph. Metals matter. Binding and the body. Exposure to air pollutants may amplify risk for depression in healthy individuals.

Costs associated with obesity may account for 3. Related Coverage. What to know about red blood cell disorders. Without oxygen connected, blood is a darker red color. Carbon monoxide, a potentially deadly gas, can also bind to heme , with a bond around times stronger than that of oxygen. Sometimes blood can look blue through our skin. But this is wrong; human blood is never blue. The bluish color of veins is only an optical illusion. Blue light does not penetrate as far into tissue as red light.

But blue blood does exist elsewhere in the animal world. Green, clear and even purple blood are seen in other animals. We know a lot of Wonder Friends think that about blood and veins, Tiarra, but did you know that blood is always red? It only "looks" blue when we see our veins under our skin! We hope you will re-visit today's Wonder to find out why! Hello, Jordan! We hope you will explore today's Wonder a little further to find out why blood is always red and veins only "appear" blue!

We like that way of thinking, Tyler! Thanks for sharing your views about veins with us today Hi, Taylor! You might be surprised to learn that blood cells are always red! We encourage you to re-visit this Wonder about blood to find out even more about why veins "look" blue! Thanks for your suggestion of a Wonder about how elephants pick up peanuts with their trunks You're absolutely right, Shirley! We appreciate your comment very much and are so happy you visited today's Wonder!

Hello, Alexis! We think it's super neat that you can see your veins, but please be careful when you are bending and squeezing your finger! We care about all of our Wonder Friends, and we don't want you to get hurt! Hi, Claire! Thanks so much for sharing what you thought about the still image for today's Wonder! Our skin becomes less elastic as we age, which makes it look more wrinkly and lets us see our blood vessels and veins even better. Thanks for sharing your comment with everyone in Wonderopolis!

We're so glad you shared what you learned by visiting today's Wonder, Eric! Thank you so much! We appreciate you sharing what you think about blood and veins, Shirley!

Hello, Jared! Thanks so much for checking out Wonderopolis! Did you know that blood cells are always red, not blue? The reason our veins "appear" blue is because of the light that is reflected off of them!

We encourage you to re-explore today's Wonder to learn more about this cool phenomenon! Thanks for sharing all the things you know about blood and veins, Josh!

We're super sorry to hear that you get sick and nauseous sometimes. We do, too, and we think being sick is NOT our favorite thing! We can't wait to see what tomorrow's Wonder is about, and we hope you can't, either! Hi, Alex! We think a lot of Wonder Friends would agree with you, but we encourage you to re-visit today's Wonder to learn why it only "appears" that the blood in our veins is blue!

Thanks so much for sharing your awesome comment with us today! Hi there, Wonder Friend! As we age, our skin gets more wrinkles and loses some of its elasticity, allowing for a more prominent view of our blood vessels and veins. Thanks so much for sharing your comment with us to let us know you thought it was cool! Hello, Sydney! Blood cells are always red. The veins just "appear" blue because of the way our eyes "see" the light waves that bounce off of them.

We agree, Hannah! We think that's a super COOL coincidence that you and your classmates are learning about blood in school, Lavell! Thanks for sharing your comment with us today! We're glad you learned some new facts about blood today! We are undergoing some spring clearing site maintenance and need to temporarily disable the commenting feature.

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If blood is red, why are veins blue? How long does it take your heart to pump blood throughout your entire body? What are the three types of blood vessels? Tags: See All Tags arteries , blood , blue , capillaries , carbon dioxide , circulation , circulatory , light , oxygen , red , system , vein , wavelength. Wonder What's Next?

Tomorrow's Wonder of the Day will really give you something to chew on. Try It Out Want to learn more about the circulatory system? Invite a friend or family member to help you check out the following fun activities: Watch this interesting online presentation about the circulatory system to see exactly how the heart and its many parts work to pump blood throughout your body. If you haven't been to the doctor for a check-up in a while, ask your parents to schedule a check-up for you.

Make sure you have the doctor or nurse help you understand how your blood pressure is measured. Is it low, high or just right?

Alternatively, you may be able to take a field trip to a local pharmacy that has a blood pressure measurement machine. Ask an adult to help you use the machine to check your blood pressure. Keeping an eye on your blood pressure in the future will help you stay healthy!

Talk to your parents about your medical history. Has anyone in your family ever had heart problems? To avoid problems of your own in the future, you should always do what you can to keep your heart healthy and working like it should. Like your other muscles, it's important to exercise it. But how do you exercise your heart?

You do cardiovascular exercises, like running, biking or jumping, that make your heart beat faster. Avoid unhealthy foods that are high in saturated or trans fats. Research has shown that smoking damages the heart and your blood vessels, so don't ever start smoking! A new look at an old question. Did you get it? Test your knowledge. Wonder Words blood vein factor absorb vessel exhale depleted wavelength reflected penetrate artery capillary carbon dioxide circulation oxygen nutrient Take the Wonder Word Challenge.

Join the Discussion. Nov 15, Nov 12, I know a way to play the same game as people who say that blood is blue because it "appears" blue and when the skin is cut the oxygen turns it red. I give that a challenge to people who say it's blue. Jun 28, Jace Jan 11, Jan 12, Bee Jun 7, Sorry, but this sounds inaccurate to the point of ridiculousness. Every 25 years there seems to be a "new" explanation about something and then they call the old way a "myth".

Ronald Elrod Jul 30, Jesse Jan 31, Brando Jun 16, Jesse so your saying that science changed the color of our blood. Feb 1, Great comment, Jesse! Thanks for sharing your thoughts with us, Wonder Friend! Jun 7, Steven R Stone Jan 9, Caitlynn Jan 29, Jan 10, Jun 4, That's correct, drew!

We're glad you learned something new! May 6, That's right, zarian! Thanks for reading the Wonder so closely! Bob Mar 23, Mar 23, Leah Jan 16, Jan 20, Jan 8, That's right, lily! Thanks for sharing what you learned! Oct 3, Cedric Sep 9, Its really cool how fast your body is! I wonder how we can get created in our parents body? Is it because particals get formed and gathered to create us?

How about blood? Did we have a tube connected to our parents heart? I loved this post a lot. Sep 11, Wonderopolis Apr 8, Sounds exciting, jaidyn brooks! How are you, neat webpage you have going here. Wonderopolis Dec 19, Maz Dec 8, So is that why in the video game Halo the aliens blood is blue maybe because they don't breathe oxygen or just the light reflecting to make it look blue?

Wonderopolis Dec 8, Abbi M. Sep 23, Wonderopolis Sep 23, Paul Jul 1, Wonderopolis Jul 2, Lilly Jun 29, Wonderopolis Jun 29, We're so glad you loved this Wonder, Lilly! Wonderopolis Apr 29, Mya Apr 4, Wonderopolis Apr 5, Red Mar 20, Can you write about ice cream?

I love them but don't know much about them. Wonderopolis Mar 21, Wonder Friend Class Mar 12, Wonderopolis Mar 12, Wonderopolis Mar 9, That picture made me hungry. Idk if it was the hands or what. Anyways I like blue veins! Thanks for your comment, Luke! We hope you liked learning in Wonderopolis today! This website is awesome, but my school doesn't have this website! Wonderopolis Mar 6, But I want people to stop being so mean to that lady's hands! Our hands might look like that someday!!!

Just think about the wonderful places she's been and all the interesting things she's touched!