The function of blood cells is it transport substances like digestive food from the small intestine to the other part of the body and carries oxygen from the lungs to the other part of the body.It also carry out waste removals from the body.

The Function of Blood Cells

Blood cells play a crucial role in the transportation of substances in both animals and plants. The three main types of blood cells are red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Each type of blood cell has specific functions that contribute to the overall transportation process.

1. Red Blood Cells (Erythrocytes)
- Red blood cells are the most abundant type of blood cell.
- They contain a protein called hemoglobin which enables them to carry oxygen from the lungs to the body tissues.
- Hemoglobin also helps in the transport of carbon dioxide, a waste product, from the body tissues back to the lungs for elimination.
- Red blood cells have a biconcave shape, which increases their surface area for efficient gas exchange.

2. White Blood Cells (Leukocytes)
- White blood cells are involved in the body's immune response and defense against pathogens.
- They have different types, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils, each with specific functions.
- Neutrophils are the most common type and are responsible for phagocytosis, engulfing and destroying bacteria and other foreign particles.
- Lymphocytes are involved in the production of antibodies and the coordination of immune responses.
- Monocytes can transform into macrophages, which are responsible for engulfing and digesting cellular debris and pathogens.
- Eosinophils and basophils are involved in allergic reactions and the defense against parasites.

3. Platelets (Thrombocytes)
- Platelets are small cell fragments involved in the clotting process.
- When blood vessels are damaged, platelets gather at the site to form a plug, preventing excessive bleeding.
- They release chemical signals to attract more platelets and initiate the formation of a clot.
- The clot helps to seal the wound and prevent the entry of pathogens.

Conclusion
In summary, blood cells have essential functions in the transportation of substances in animals and plants. Red blood cells carry oxygen and carbon dioxide, white blood cells defend against pathogens, and platelets contribute to blood clotting. Understanding these functions helps us appreciate the importance of blood cells in maintaining the overall health and functioning of organisms.