The hematological system is made up of blood and bone marrow, which produces new red blood cells through a process called hematopoiesis. Blood is a connective tissue that carries nutrients, oxygen, waste, and other substances throughout the body. Blood also helps regulate body temperature.  Blood has many functions, including: Transporting oxygen and nutrients Red blood cells contain hemoglobin, which binds oxygen and delivers it to cells. Blood also transports nutrients to the lungs and tissues. Removing waste Blood carries waste products to the kidneys and liver, which filter and clean... Show more

The hematological system is made up of blood and bone marrow, which produces new red blood cells through a process called hematopoiesis. Blood is a connective tissue that carries nutrients, oxygen, waste, and other substances throughout the body. Blood also helps regulate body temperature. 

Blood has many functions, including:
Transporting oxygen and nutrients
Red blood cells contain hemoglobin, which binds oxygen and delivers it to cells. Blood also transports nutrients to the lungs and tissues.
Removing waste
Blood carries waste products to the kidneys and liver, which filter and clean the blood.
Forming blood clots
Blood clots prevent excess blood loss.
Carrying cells and antibodies

White blood cells fight infection, while platelets are needed for blood clotting. 

Blood is made up of about 45% cells and 55% plasma, and the cells are made up of plasma and cellular components.  The different types of blood cells are:
Red blood cells: These cells lack a nucleus and transport oxygen to the body's cells.
White blood cells: These cells protect the body from disease.
Platelets: These fragments of multinucleate cells are needed for blood clotting.

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