Human Body : A Complex And Extraordinary Living Machine

1325 Words Oct 26th, 2015 6 Pages
The human body can be thought of as a very complex and extraordinary living machine. Just like any machine our bodies are composed of smaller parts that work together.
There are various tasks that are performed each day by our bodies. These tasks include breathing, eating, digesting food and the movement of our blood. These processes are performed by specialised structures known as organs. Examples of organs include the lungs, stomach, heart and brain. All of these organs and other parts of our bodies are made up of smaller living units called cells.
An important point about cells is that no matter what their role is in the body, they all have the same general structure. The cells that make up our lungs, heart or brain are all similar in their overall appearance, although their jobs are quite different.
Cells are composed of a cytoplasm enclosed within a membrane containing many biomolecules such as proteins and nucleic acids. Organisms are classed as either multicellular or unicellular. Multicellular organisms includes plants and animals and unicellular including bacteria and single cell organisms.
There are two types of living cells, prokaryotes and eukaryotes.
Prokaryotes where the first form of life on Earth. In comparison to eukaryotes they are a lot simpler in structure and lack membrane bound organelles such as a nucleus. They can typically be found in organisms such as bacteria and archaea. A prokaryotic cell will have a flagellum which is the tail like…
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