This grayscale electron micrograph shows a detailed view of mitochondria. The image prominently features a large, irregularly shaped mitochondrion with convoluted internal folds known as cristae. The cristae greatly increase the surface area available for cellular respiration. Another smaller mitochondrion is visible to the right, also displaying internal structures. The overall appearance is highly detailed due to the high magnification of electron microscopy. The image has a grainy texture, which is typical of electron micrographs.