a mitochondrion is a kind of cellular organelle
mitochondrial_matrix is organelle_part. mitochondrion is internal_body_part. mitochondrion is eukaryotic_cell_organelle. outer_mitochondrial_membrane is organelle_part. inner_mitochondrial_membrane is organelle_part. mitochondrion is organelle. cell_nucleus is organelle. sarcosome is mitochondrion. organelle is cell_part.