Explain how the ultrastructure of a hepatocyte (liver cell) is adapted for its role in detoxification and metabolic processing.

A hepatocyte has a specialised ultrastructure that supports its detoxification and metabolic functions. 1. It contains a large amount of smooth endoplasmic reticulum (SER). The extensive SER provides a huge surface area for cytochrome P450 enzymes and other detoxifying enzymes, allowing efficient breakdown of lipid‑soluble toxins. 2. It is rich in mitochondria. The many mitochondria supply the ATP needed for energy‑intensive reactions such as gluconeogenesis, urea synthesis and active transport of metabolites. 3. It contains numerous peroxisomes. Peroxisomes house catalase and oxidases that oxidise toxic substances (e.g. hydrogen peroxide, ethanol) and convert H₂O₂ into water and oxygen, protecting the cell from oxidative damage. 4. It has a large nucleus with a prominent nucleolus and is often polyploid. This reflects the high transcriptional activity required to produce the diverse array of metabolic enzymes; alternatively, the extensive rough ER and Golgi apparatus enable synthesis and processing of plasma proteins such as albumin and clotting factors.