Biology / Unit 13 Bio 3195 short lesson, about 20 seconds
Platelets and the Clotting Cascade
Captions available
The idea
Platelets, cell fragments rather than whole cells, trigger a clotting cascade that amplifies through positive feedback, per Bio 2751, until a fibrin clot seals a vessel injury.
In practice
Platelets aggregating at a cut activate more clotting factors until the fibrin mesh halts blood loss.
Where people slip
The clotting cascade is a healthy example of positive feedback, per Bio 2751, not evidence of malfunction.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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