International A Level Biology / Mammalian transport systems

Blood clotting and its role in CVD

Edexcel International A Level Biology (YBI11), chapter 2: Mammalian transport systems, specification point 1.11. Part of the full course.

Read the revision notes · International A Level Biology past papers

Blood clotting seals damaged vessels through a chain of reactions that ends in a fibrin mesh. The same process can block an artery when a clot forms at a ruptured atherosclerotic plaque, causing a heart attack or stroke.

More lessons in Mammalian transport systems

• Why many animals need a heart and circulation
• Blood and haemoglobin: carrying oxygen and carbon dioxide
• The oxygen dissociation curve
• The Bohr effect and fetal haemoglobin
• Arteries, veins and capillaries
• The structure of the mammalian heart
• The cardiac cycle and the pressure graph
• Dissecting a mammalian heart
• How atherosclerosis develops