Interestingly, vertibrates rely heavily on metals for the strength of their skeletons via the calcium mineral matrix calcium hydroxiapatite, up to 50% by volume and 70% by weight of human bone is a modified form of hydroxyapatite.

And many of our enzymes contain metals (magnesium, a lot), and some transport proteins too (famously haemoglobin).

Zinc is essential in humans for DNA replication. We need chromium and molybdenum in tiny amounts for blood sugar control and hunger regulation.

Though none of these seem quite as spectacular as metal plares body parts!