08/31/2026
For Mitochondria Monday, the team asked me what drives me crazy about the way people talk about mitochondria.
Two things came to mind immediately:
1. We keep drawing one mitochondrion per cell, when a cell can contain hundreds to thousands of them. Mitochondria are far more numerous, dynamic, and biologically interesting than the textbook “powerhouse” story suggests.
2. “Mitochondria are the powerhouse of the cell” is a bit like calling a human a carbon-dioxide generator for plants: technically connected to reality, but absurdly reductive.
Yes, humans produce CO₂. Yes, plants use it. But reducing a human being to that output ignores almost everything else humans do. In the same way, mitochondria produce ATP. But ATP production is a byproduct of their REAL function: Survival and Propagation.
From an evolutionary perspective, survival and propagation are THE fundamental pressures shaping mitochondrial biology. In the context of their symbiotic relationship with their host cells, they are involved in metabolism, redox regulation, calcium signaling, apoptosis, biosynthesis, immune signaling, and making sure their host cells stay healthy.
Here’s my rant.