Question

What is the importance of blood platelets?

Hint:

Platelets → “{C-H-D}” → Clotting, Healing, Defence.

Answer 1

Step 1: What are platelets?
Blood platelets (also called thrombocytes) are small, colourless cell fragments present in blood. They are formed in the bone marrow.
Step 2: Importance of Platelets
Blood Clotting: When an injury occurs, blood platelets rupture and release clotting factors. These factors activate fibrinogen present in plasma to form fibrin threads, which trap red blood cells and form a clot. This prevents excess blood loss.
Wound Healing: Platelets release growth factors that help in tissue repair and healing at the site of injury.
Defence Mechanism: By preventing excessive bleeding, platelets protect the body from infections that might enter through open wounds.
Step 3: Medical Importance
A low platelet count (thrombocytopenia) is dangerous as it can lead to uncontrolled bleeding, as seen in diseases like dengue.
Final Answer:
Blood platelets are essential for blood clotting, wound healing, and prevention of excessive bleeding and infections.