We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Is the Role of Blood in the Human Body?

By Geisha A. Legazpi
Updated Mar 03, 2024
Our promise to you
The Health Board is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At The Health Board, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

As blood in the human body circulates, oxygen and nutrients are delivered to cells while waste products are simultaneously collected and transported to organs that get rid of them. Additionally, blood has special cells that safeguard the body against disease-causing germs, thereby acting as armor against infection. One blood component seals damaged blood vessels to stop blood from leaking. Blood also plays a role in heat distribution. With these functions, blood acts as the transport, waste removal, defense, repair, and heat maintenance mechanism of the human body.

Veins, arteries, and capillaries are all a part of a network moving oxygen and nutrients through the body, and removing waste products. From the heart, the first blood vessel through which blood passes is an artery called aorta. Blood in the human body then passes through capillaries then through veins and back to the heart. The heart, blood vessels, and blood work together to make up the circulatory system, which supplies all the needs of body cells.

Blood in the human body contains red and white blood cells, platelets, and plasma. As blood passes through the lungs, oxygen is picked up by a substance called hemoglobin in red blood cells. The transport of nutrients and waste products, as well as the maintenance of body temperature, is the role played by plasma, a liquid that consists of water and other substances such as cholesterol. Plasma also serves as the medium for the transport of the other blood components in order for them to perform their functions.

White blood cells, particularly the lymphocytes and phagocytes, destroy disease-causing germs that are trying to cause infection in the body. Chemical compounds called antibodies are released by lymphocytes in order to weaken germs that will be engulfed by phagocytes. Lymphocytes also have the ability to recognize germs that have already caused infection, which prompts them to react more quickly if the same germs will try to cause an infection again. Neutrophils, eosinophils, basophils, and monocytes are all types of white blood cells that have specific roles in the fight against infections.

Platelets are a component of blood in the human body that are much smaller than both red and white blood cells. A substance that platelets release as they disintegrate, called thrombokinase or thromboplastin, is crucial in the clotting of blood. Another important role of platelets is the plugging of capillary leaks that may otherwise become an entry point for germs. Blood loss may also be prevented by this action.

The Health Board is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
The Health Board, in your inbox

Our latest articles, guides, and more, delivered daily.

The Health Board, in your inbox

Our latest articles, guides, and more, delivered daily.