---
title: "Mitochondrial Matrix — AP Bio Definition & Exam Guide"
description: "The mitochondrial matrix is the inner compartment of the mitochondrion where the Krebs cycle runs. Learn how it fuels ATP production for the AP Bio exam."
canonical: "https://fiveable.me/ap-bio/key-terms/mitochondrial-matrix"
type: "key-term"
subject: "AP Biology"
---

# Mitochondrial Matrix — AP Bio Definition & Exam Guide

## Definition

The mitochondrial matrix is a gel-like substance inside mitochondria where certain metabolic reactions occur.

## Related Study Guides

- [2.1 Cell Structure and Function](/ap-bio/unit-2/cell-structure-subcellular-components/study-guide/oFM5gT3D8Pj5lZXmTNB9)

## Review

### Related Terms

- [Mitochondrion](/ap-bio/key-terms/mitochondrion): This is cell organelle hosting mitochondrial matrix; it’s like entire bakery building housing kitchen space and ovens.
- Citric Acid Cycle/Krebs Cycle: One of key metabolic processes happening within mitochondrial matrix; it’s akin to recipe followed by baker to prepare dough for pastries.
- Pyruvate Dehydrogenase Complex (PDC): An enzyme complex initiating reaction sequence in Krebs cycle; think of PDC as head chef directing preparation process in kitchen.