By definition, a tissue is an organization of a great many similar cells with varying amounts and kinds of nonliving, intercellular substance between them. Cells make up tissue, tissue makes organs, organs make up organisms. Its two principle components are collagen and calcium phosphate. Bone, rigid body tissue consisting of cells embedded in an abundant hard intercellular material. The human body, like all organic compounds, contains a significant amount of carbon. The human body is composed of trillions of cells. The cells in our bodies are full of water. Organs. Learn more about the composition and function of bone. Oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus are the elements that make up 99 percent of the human body's mass. Those muscles you work so hard to build, and that fat you always meant to lose. The four elements are oxygen, hydrogen, carbon, nitrogen. To answer this question I’m going to start by talking about bigger things and moving us down into smaller things. For their reference man, it's about 30 trillion, the researchers estimate. Bone tissue makes up the individual bones of the skeletons of vertebrates. It might seem unlikely: the body feels quite solid. Every living thing is composed of cells. Not all of the numerous other elements found in the human body actually play a significant role in human life. Is human body made of cells or atoms or molecules? The human body is made of all of the above. Water's "stickiness" (from surface tension) plays a part in our body's ability to transport these materials all through ourselves. Is the human body made up of eukaryotic cells? Despite the fact that we have gobs of prokaryotic cells living inside and on us, humans are still categorically eukaryotic organisms. On the other hand, the human cells in your body form all types of material you’re made of. This is where the reference man comes in - narrowing down the sex, age, weight, and height of a hypothetical human made it a whole lot easier for the reviewers to figure out what the average number of human cells would be. Carbon, the basic unit for organic molecules, comes in second. But most of you is made up of cells filled with water. Cells have many parts, each with a different function. So, if an organ is damaged, it means the cells and cell structure in the organ are also damaged. A group of cells from a tissue and a group of tissues form an organ.. A group of organs makes up an organ system and a group of organ systems make up the human body.. There’s enough structure to make it unlikely that you will run down the drain, but there is plenty of water there. So let’s focus on skin for a moment. However, some "parts" of your body are not made up cells, this includes your hair and fingernails which are both made up of the protein keratin. Your bones, and your teeth, your brain and all your body fluids including blood and, well, urine. The excellent ability of water to dissolve so many substances allows our cells to use valuable nutrients, minerals, and chemicals in biological processes. The body is a whole bunch of stuff covered in skin. Cells also contain the body’s hereditary material and can make copies of themselves. Tissues are somewhat more complex units than cells. Cells in a human body are of different types based on their structure and function. In fact, over half of the human body is made up of water (50-70%). Before you start thinking we should float away with all the oxygen, hydrogen, and nitrogen atoms, remember that the oxygen molecules are mainly part of the water in our body (H2O). The most common figure is that around 60 per cent of your body is water – even your bones are about 30 per cent aqueous. Scientifically, a Cell is the basic unit of life. Let’s start with the human body. 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