Question

Using two examples from different body systems (e.g., humans are multicellular organisms) explain the different levels of cell organization within those systems.

Accepted Answer

Body systems work together to provide the functions of life to human organisms. The organism is the most complex level of organization. The levels below it, in descending order, are organ systems, organs, tissues, and cells.
 
The cell is often called the building block of life. Cells perform different functions in different areas of the body. Cells can work together to form tissues. Two or more tissues can work together to form an organ. An organ is a distinct structure that performs a specific function for the body. Organs can work together as organ systems.
 
The specialized cells of the skeletal system are responsible for bone growth and shaping. Cells in the skeletal system can also form connective tissues. Specialized tissues can work together to form organs like bones, ligaments, tendons, and cartilage. The skeletal system works with other body systems to move, create red blood cells, and protect other organs.
 
The digestive system has a great diversity of cellular specialization. Some cells secrete gastric acid, others form digestive tract tissues. The organs of the digestive system include the gastrointestinal tract and the accessory organs. Together, they break down nutrients and fuel other systems.

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Using two examples from different body systems (e.g., humans are multicellular organisms) explain the different levels of cell organization within those systems.

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