Blood

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Blood is one of the, if not the most essential moving component of the human body or multicellular animals.

Contents

Functions

Plasma is a portion of the blood, which is a straw colored clear type of liquid. This liquid is comprised largely of water in which dissolved ions, proteins, carbohydrates, fats, hormones, vitamins, and enzymes are suspended and circulate throughout the body. The platelets, which help with blood clotting are carried by the plasma. Without platelets one could bleed to death from common injuries. It is the river of life and provides transport for oxygen from the lungs to the body tissue and carbon dioxide from the body tissue to the lungs.

Composition

Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte.
Human blood smear: a - erythrocytes; b - neutrophil; c - eosinophil; d - lymphocyte.

Blood is composed of a liquid called plasma and cellular elements, including leukocytes (white blood cells), thrombocytes (platelets), and erythrocytes (red blood cells). The normal adult has approximately six liters of blood and comprises about 7% to 8% of the total body weight. Plasma makes up approximately 55% of the blood volume, the erythrocytes makes up about 45% of the volume, and about 1% of the volume is composed of leukocytes and thrombocytes.

Erythrocytes

Main Article: Red blood cells

Leukocytes

Main Article: White blood cells

thrombocytes

Main Article: Platelet

Mythology and religion

Judaism

Several times in the Old Testament blood is referred to as being, or containing, the life of a creature.

But be sure you do not eat the blood, because the blood is the life, and you must not eat the life with the meat. Deuteronomy 12:23

Another mention is Leviticus 17:11 .

Christianity

Related References

  • Blood by Wikipedia
  • "Blood" Encyclopedia Britannica 2007 Ultimate Reference Suite
  • Textbook of Hematology, second edition, c. 1996, Shirlyn B. McKenzie

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