What is blood?

Blood is both a tissue and a fluid. It is a tissue because it is a collection of similarly specialized cells that serve particular functions. These cells are suspended in a liquid matrix (plasma), which makes the blood fluid.
 
Recall that blood is a connective tissue. Like all connective tissues, it is made up of cellular elements and an extracellular matrix. The cellular elements—referred to as the formed elements—include red blood cells (RBCs), white blood cells (WBCs), and cell fragments called platelets.
 
Blood is considered a connective tissue because it has a matrix. The living cell types are red blood cells, also called erythrocytes, and white blood cells, also called leukocytes. ... Erythrocytes (red blood cells), the predominant cell type, are involved in the transport of oxygen and carbon dioxide.
 
Blood is a fluid connective tissue that consists of plasma, blood cells and platelets. It circulates throughout our body delivering oxygen and nutrients to various cells and tissues. It makes up 8% of our body weight.
 
Blood components
  • Plasma. Plasma constitutes 55% of total blood volume. ...
  • White Blood Cells. There are between 6,000 and 8,000 white cells per cubic millimetre of blood. ...
  • Platelets. Platelets, or thrombocytes, are smaller than the red and white blood cells. ...
  • Red Blood Cells.
 
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