In the mitochondrion, the matrix is the space within the inner membrane. The word "matrix" stems from the fact that this space is viscous, compared to the relatively aqueous cytoplasm. The mitochondrial matrix contains the mitochondrial DNA, ribosomes, soluble enzymes, small organic molecules, nucleotide See more. The mitochondrion consists of an outer membrane, an inner membrane, and a gel-like material called the matrix. This matrix is more viscous than the cell's .
As discussed in the next section of this chapter, the transfer of high-energy electrons from NADH and FADH to molecular oxygen is coupled to the transfer of protons from the Missing: definition. to·chon·dri·al ma·trix. the substance occupying the space enclosed by the inner membrane of a mitochondrion; it contains enzymes, filaments of DNA, granules, and .