Mitochondria Structure: Inner and Outer Membranes

Mitochondrial Membranes

• The inner mitochondrial membrane is the site where cellular respiration takes place, specifically the electron transport chain and ATP synthesis.
• The outer mitochondrial membrane is semi-permeable, allowing certain substances to pass through while keeping others out, and is involved in the regulation of mitochondrial dynamics.

Determinants of Biochemical Function

• The biochemical function of the two membranes in mitochondria is determined by their unique composition of proteins and lipids.

Mitochondrial Cristae

• The invaginations called mitochondrial cristae increase the surface area of the inner mitochondrial membrane, allowing for a greater number of electron transport chains and therefore increased ATP production.

Intermembrane Space

• The composition of the intermembrane space in mitochondria is similar to that of the cytosol, with a high concentration of ions and metabolites.