Red blood cell

Wound in skin

Platelet gather StickyForms a temporary plugin leaking vessel

Produce Trombokinase

Trombokinase

Ion Calcium

Prothrombin

Need Vitamin D

ThrombinFibrinogen

Fibrin

Forms the threads of the clot

Later

Harden (scab)

Mechanism of blood clotting

Whenever an injury occurs a chain reaction is set off.

Wound in skin

Wound in skin

Platelets gather at a site of the injury and become sticky

Platelet

Forming a temporary plug in the leaking vesselForming a temporary plug in the leaking vessel

Wound in skin

Prothrombin (non-active enzyme) need ion Prothrombin (non-active enzyme) need ion calcium to convert into thrombin.calcium to convert into thrombin.

Trombokinase

Ion CalciumProthrombin

Vitamin K

Thrombin

Thrombin converts soluble fibrinogen Thrombin converts soluble fibrinogen (plasma protein formed by the liver) into (plasma protein formed by the liver) into

insoluble fibrin. Fibrin forms the threads of insoluble fibrin. Fibrin forms the threads of the clotthe clot

Thread of clot

A mesh-like network of A mesh-like network of fibrin traps red blood fibrin traps red blood

cells together, forming cells together, forming the blood clot, which later the blood clot, which later

hardens into a scab. hardens into a scab.