Select from the frequently asked questions below
- The human body is organized at different levels, starting with the cell and ending with the entire organism.
- At each higher level of organization, there is a greater degree of complexity.
- There are four basic types of human tissues: epithelial, muscle, nervous, and connective tissues.
- An organ is a structure that consists of two or more types of tissues that work together to do the same job.
- Examples of human organs include the brain, heart, lungs, skin, and kidneys.
- Your body’s 12 organ systems are shown below (Table below)
Water contains twice as many atoms of hydrogen as it does of oxygen. Why isn't hydrogen listed as the most common element in the human body, rather than oxygen?