International A Level Biology / Mammalian transport systems

The structure of the mammalian heart

Edexcel International A Level Biology (YBI11), chapter 2: Mammalian transport systems, specification point 1.8. Part of the full course.

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The heart has two sides that pump blood through the lungs and the rest of the body. Knowing its chambers, valves and vessels helps you trace blood flow and explain how the heart pumps at different pressures.

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 cardiac cycle and the pressure graph
• Dissecting a mammalian heart
• How atherosclerosis develops
• Blood clotting and its role in CVD