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How many types of blood cells are there?

Answer 1

Three broad types: erythrocytes, leucocytes, and thrombocytes, with subtypes. See below.

Blood contains three broad types of blood cells.

Erythrocytes (Red Blood Cells/Corpuscles) are cells that carry oxygen to parts of the body for energy. They contain haemoglobin which binds with oxygen in the lungs.

Leucocytes (White Blood Cells/Corpuscles) are cells that help in fighting infection and confer temporary as well as lasting immunity to different antigens. There are three different subtypes of leucocytes: lymphocytes, monocytes, and granulocytes; again, there are three types of granulocytes: eosinophils, basophils, and neutrophils. Monocytes produce macrophages in response to an infection.

Thrombocytes (Platelets) are cells that help in clotting of blood when a blood vessel is ruptured.

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Answer 2

Hudson Dean

There are three main types of blood cells: red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.