Like all humans have red colored blood, there are few organisms which have varying blood colors. Spiders and octopus have blue color blood, cockroaches have white/colorless blood, grasshopper, leeches, and some varieties of earthworm have green color blood and so on. Apart from these, there are more facts about the blood. In this article, few interesting facts about Blood and Blood Cells of the human body.

Blood is the only fluid connective tissue in the human body and it plays a major role in the transportation of nutrients, respiratory gases, hormones, etc. Apart from the transportation, blood is also involved in maintaining and regulation of body temperature, pH, and other thermoregulation processes. As per the scientists’ estimations, the total volume of the blood in the human body should be approximately seven percent of the total body’s weight which will be about 5 to 5.5 liters (1.5 gallons) of blood.

Blood is generally composed of red blood cells (RBCs), white blood cells (WBCs), blood platelets, and plasma that includes protein, salts, and water. William Harvey, an English physician was the first person to recognize and conduct experiments on the blood, and its circulation in the human body.

10 interesting Facts about Blood and Blood Cells

  1. Blood makes up about seven percent of total body’s weight. A healthy adult human body contains approximately 1.325 gallons of blood and a newborn baby has approximately one cup of blood in its body.
  2. Patients suffering from certain diseases like trauma, cancer, and undergoing open-heart surgery require platelets transfusions for their survival.
  3. There are four major blood types in ABO blood groups system which are differentiated by the presence of antigens and antibodies on the surface of the erythrocytes or red blood cells. Among which blood group O is called as universal donor and blood group AB is called as the universal recipient.
  4. Like eye, skin color, hair texture and other body features, blood group is also inherited genetically from our parents.
  5. As per studies conducted, different blood groups result in varying nutritional needs and affects the personality, fertility, stress levels, etc.
  6. These blood cells are found floating in the yellow colored liquid called blood plasma. This blood plasma is composed of about 85 to 90% of water along with other nutrients, proteins, gases, hormones, etc.
  7. There are around 2 to 2.4 trillion of red blood cells in one bottle of blood and about 140 to 150 billion of red blood cells in one ounce or 0.03 lt of blood.
  8. Our body produces 16 -17 million of red blood cells in every second and it takes 20 to 60 seconds for a single drop of blood to travel from the heart to other parts of the body and vice versa.
  9. A single drop of blood contains about forty percent of red blood cells, one percent of white blood cells, four percent of platelets and fifty five percent of plasma.
  10. Apart from erythrocytes, leukocytes, thrombocytes, and hormones, human blood also contain metal atoms, including copper, chromium, iron, lead, manganese, zinc and 0.2 milligrams of gold.

These facts about blood & blood cells were brought to you by BYJU’S. For more details about the blood cells and blood groups, students can visit the BYJU’S website and learn more about the various Biology related topics easily and effectively from engaging video lessons provided on their YouTube channel.


Feel free to ask questions, send feedback and even point out mistakes. Great conversations start with just a single word. How to write better comments?
Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

You May Also Like

Everywhere Continuous Non-differentiable Function

Weierstrass had drawn attention to the fact that there exist functions which are continuous for every value of $ x$ but do not possess a derivative for any value. We now consider the celebrated function given by Weierstrass to show this fact. It will be shown that if $ f(x)= \displaystyle{\sum_{n=0}^{\infty} } b^n \cos (a^n \pi x) \ \ldots (1)…

Meet A1689B11 : The oldest spiral galaxy ever discovered

In a collaborative attempt, astrophysicists from different institutions have found success in discovery of A1689B11 – a spiral galaxy that’s said to be the oldest discovered. The research reports an integral-field spectroscopic (IFS) observation of this gravitationally lensed spiral galaxy. It is the most ancient one till date and is calculated to be 11 billion years old, which means it existed…

Albert Einstein and His introduction to the Concept of Relativity

Albert Einstein This name need not be explained. Albert Einstein is considered to be one of the best physicists in the human history. The twentieth century has undoubtedly been the most significant for the advance of science, in general, and Physics, in particular. And Einstein is the most luminated star of the 20th century. He literally created cm upheaval by…

Examination Strategies : Tactics & Tips

Every student or graduate knows how hard the first experience of passing exams is. Preliminary preparation starves the nervous system and the physical condition of the human body, however, the exam itself is always a stressful situation, which requires a candidate a great manifestation of mental and physical abilities. Therefore, just the knowledge of a subject is not enough for…