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Circulatory System

Last Updated on Nov 02, 2023
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Heartbeat

  • The heart beats approximately 100,000 times a day (1 Trusted Source
    A healthy heart is not a metronome: an integrative review of the heart's anatomy and heart rate variability

    Go to source
    ).
  • The lub-dub sound is due to the blood flowing through the heart chambers during the cardiac cycle (2 Trusted Source
    Physiology, Heart Sounds

    Go to source
    ).
  • The heartbeat of a woman is faster than that of a man (3 Trusted Source
    Role of biological sex in normal cardiac function and in its disease outcome - a review

    Go to source
    ).
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Composition of Blood

  • Human blood is made up of red blood cells that carry oxygen, white blood cells that fight disease, platelets that help the blood clot, and a liquid portion called plasma (4 Trusted Source
    Blood

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    ).

Red Blood Cells

  • Every second, 5 million red blood cells are removed from the circulatory system (5 Trusted Source
    How Do Red Blood Cells Die?

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    ).
  • The average lifespan of red blood cells is 120 days (5 Trusted Source
    How Do Red Blood Cells Die?

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    ).
  • Red blood cells do not contain a nucleus (6 Trusted Source
    Blood Groups and Red Cell Antigens

    Go to source
    ).

White Blood Cells

  • There are about 30-40 billion white blood cells present in our body to fight against infective and foreign organisms.
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Platelet Production

  • Platelets, which form a part of the blood cell component are produced at a rate of 100 billion per day (7 Trusted Source
    Emerging Concepts in Immune Thrombocytopenia

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    ).

Blood Volume

  • An adult human body contains five liters of blood and an infant has about one liter of blood (8 Trusted Source
    Physiology, Blood Volume

    Go to source
    ).

Circulation of Blood

  • On average, human blood circulates through the whole body every 23 seconds.

Function of the Aorta

  • The aorta is the major artery that transports blood from your heart to the rest of your body (9 Trusted Source
    Anatomy, Abdomen and Pelvis: Aorta

    Go to source
    ).

Pulmonary Veins

  • The pulmonary vein is the only vein in the human body that carries oxygenated blood, while all the other veins of the body carry deoxygenated blood (10 Trusted Source
    Anatomy, Thorax, Lung Veins

    Go to source
    ).

Cornea and Blood Supply

  • The cornea in the eye is the only part of the body that does not have a blood supply (11 Trusted Source
    Absence of blood and lymphatic vessels in the developing human cornea

    Go to source
    ).

Production of Blood Cells

  • Each day, an adult can produce one trillion blood cells, including 200 billion red blood cells (12 Trusted Source
    Hematopoiesis

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    ).

Thickness of Heart

  • The left side of the human heart is much thicker and stronger than the right side (13 Trusted Source
    Physiology, Left Ventricular Function

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    ).

Kidney Filtration

  • Each day, the kidneys filter about 1700 liters of blood (14 Trusted Source
    How does the urinary system work?

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    ).

Smallest Blood Vessel

  • Capillaries are the smallest blood vessels in the body; it would take ten of them to equal the thickness of a human hair (15 Trusted Source
    Classification & Structure of Blood Vessels

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    ).

Length of the Blood Vessel

  • An average adult has about 60,000 miles of blood vessels (16 Trusted Source
    Blood and lymphatic vessel formation

    Go to source
    ).

References:

  1. A healthy heart is not a metronome: an integrative review of the heart's anatomy and heart rate variability - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4179748/)
  2. Physiology, Heart Sounds - (https://www.ncbi.nlm.nih.gov/books/NBK541010/)
  3. Role of biological sex in normal cardiac function and in its disease outcome - a review - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4190707/)
  4. Blood - (https://medlineplus.gov/blood.html)
  5. How Do Red Blood Cells Die? - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8006275/)
  6. Blood Groups and Red Cell Antigens - (https://www.ncbi.nlm.nih.gov/books/NBK2263/)
  7. Emerging Concepts in Immune Thrombocytopenia - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5937051/)
  8. Physiology, Blood Volume - (https://pubmed.ncbi.nlm.nih.gov/30252333/)
  9. Anatomy, Abdomen and Pelvis: Aorta - (https://www.ncbi.nlm.nih.gov/books/NBK537319/)
  10. Anatomy, Thorax, Lung Veins - (https://www.ncbi.nlm.nih.gov/books/NBK545205/)
  11. Absence of blood and lymphatic vessels in the developing human cornea - (https://pubmed.ncbi.nlm.nih.gov/17077668/)
  12. Hematopoiesis - (https://www.sciencedirect.com/topics/medicine-and-dentistry/hematopoiesis)
  13. Physiology, Left Ventricular Function - (https://www.ncbi.nlm.nih.gov/books/NBK541098/)
  14. How does the urinary system work? - (https://www.ncbi.nlm.nih.gov/books/NBK279384/)
  15. Classification & Structure of Blood Vessels - (https://training.seer.cancer.gov/anatomy/cardiovascular/blood/classification.html)
  16. Blood and lymphatic vessel formation - (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4355271/)
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