The Circulatory System, Part 2

The Circulatory System, Part 2

In the second of our two-part series for the circulatory system, we discuss the chemical and physical science applications of the circulatory system. The latter has big overlaps with fluid dynamics, gas exchange, and even Ohm’s law. Join us to see how the MCAT tests the circulatory system from biological angles and beyond.

At a glance


Essential skills

  • Apply equations about the heart and understand how they are derived from equations in fluids and circuits

  • Read graphs and diagrams about the circulatory system


Knowledge Fundamentals

  • Fluids and circuits in relation to the circulatory system

  • AEDs and pacemakers

  • Cardiac action potential

  • Gas exchange of oxygen and carbon dioxide

  • Hemoglobin structure and shape

  • The buffer system of the blood


On the MCAT

  • The circulatory system is the most content and skill rich system on the MCAT. It has a huge biological footprint but also connects to many areas of basic sciences

  • It is impossible to cover all topics that you might see on the MCAT related to this system but most of the low yield/other information the passage will provide!


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