Question

The chart below is a summary of blood clotting mechanisms in man.

1. Name
   1. The blood cells represented by X.   
   2. Metal ion represented by Y.  
2. Identify product Z and state its significance. 

Answer 1

1.  
   1. Platelets
   2. Calcium ions / Ca⁺²
2. Fibrin; it forms an insoluble meshwork that seals the broken surface.

Answer 2

X: Red blood cells
Y:Calcium ions
Z:Fibrin- forms a meshwork on the injured vessel hence a blood clot