Free MCAT Resources

Endocrine System

The endocrine system is tested in relation to its organs, hormones, mechanisms of action (peptide vs. steroid hormones), feedback loops, and its integration with other organ systems.

GenerallyBread

Fermentation and Cori Cycle

The Cori Cycle is metabolism-focused, describing the cycling of lactate from muscles to the liver and back as glucose. It’s part of glucose metabolism regulation, and tested alongside gluconeogenesis and glycolysis.

GenerallyBread

Gluconeogenesis

Gluconeogenesis is one of the key metabolic pathways you’re expected to know (alongside glycolysis, glycogenolysis, and the pentose phosphate pathway).

GenerallyBread

PDH Complex

The PDH complex is key in linking glycolysis to the citric acid cycle by converting pyruvate to acetyl-CoA.

GenerallyBread

Pentose Phosphate Pathway

The pentose phosphate pathway generates NADPH and ribose-5-phosphate, supporting reductive biosynthesis and nucleotide synthesis.

GenerallyBread