No, the human body is not made up of only living cells. While the majority of our body is composed of living cells, there are also significant amounts of non-living material that are crucial for our function. These include:

* Water: Water makes up about 55-78% of our body weight and is essential for many bodily processes.

* Minerals: These are inorganic elements like calcium, phosphorus, potassium, and iron, which are needed for building bones, regulating fluids, and many other functions.

* Extracellular Matrix: This is a network of proteins and carbohydrates that provides structural support for cells and tissues.

* Other non-living components: This includes things like hair, nails, and even the air in our lungs.

So, while the majority of our body is composed of living cells, the non-living components are equally important for maintaining our overall health and functioning.