The human body, which is made up of numerous cells, begins as a single, newly fertilized cell. In fact, over half of the human body is made up of water (50-70%). Scientifically, a Cell is the basic unit of life. Let’s start with the human body. Organs. But most of you is made up of cells filled with water. The body is a whole bunch of stuff covered in skin. To answer this question I’m going to start by talking about bigger things and moving us down into smaller things. Water's "stickiness" (from surface tension) plays a part in our body's ability to transport these materials all through ourselves. Every living thing is composed of cells. The most common figure is that around 60 per cent of your body is water – even your bones are about 30 per cent aqueous. Bone, rigid body tissue consisting of cells embedded in an abundant hard intercellular material. Your bones, and your teeth, your brain and all your body fluids including blood and, well, urine. Carbon, the basic unit for organic molecules, comes in second. Is human body made of cells or atoms or molecules? Cells make up tissue, tissue makes organs, organs make up organisms. 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. Tissues are somewhat more complex units than cells. By definition, a tissue is an organization of a great many similar cells with varying amounts and kinds of nonliving, intercellular substance between them. It might seem unlikely: the body feels quite solid. Despite the fact that we have gobs of prokaryotic cells living inside and on us, humans are still categorically eukaryotic organisms. Those muscles you work so hard to build, and that fat you always meant to lose. 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. 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). So, if an organ is damaged, it means the cells and cell structure in the organ are also damaged. Therefore, it isn't surprising that most of a human body's mass is oxygen. The four elements are oxygen, hydrogen, carbon, nitrogen. Learn more about the composition and function of bone. There’s enough structure to make it unlikely that you will run down the drain, but there is plenty of water there. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. The human body, like all organic compounds, contains a significant amount of carbon. 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.. Cells also contain the body’s hereditary material and can make copies of themselves. The excellent ability of water to dissolve so many substances allows our cells to use valuable nutrients, minerals, and chemicals in biological processes. The cells in our bodies are full of water. Cells in a human body are of different types based on their structure and function. Bone tissue makes up the individual bones of the skeletons of vertebrates. Oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus are the elements that make up 99 percent of the human body's mass. On the other hand, the human cells in your body form all types of material you’re made of. Not all of the numerous other elements found in the human body actually play a significant role in human life. Tissues. 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