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Complementarity is the relationship in physiology to function.
The roach has over 2000 lenses in its eye which allows it to see multiple things at the same time.

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Simple squamous is a thin layer because it allows for oxygen molecules to diffuse through the membrane.

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In this experiment action potentials were modeled because action potentials are phenomenas that require energy stored in ionic gradients.  So, in this case the metals had voltage controlled channels that made the leg move.

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Homeostasis is when the body does something to maintain internal conditions of the body. For example, in humans if it is cold outside, our body shivers to keep us warm. In this case for the roach, when the leg is cut off, its body notices the problem and it starts to grow back the leg that was cut.

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Each level relating to roach experiment:
Atom-They start coming together for the healing process.
Molecule-This is when the atoms actually starting coming together and soon become cells.
Cell-The cells regenerate when the leg grows back.
Tissue-Becomes bigger and more usable.Parts become more bigger and have functions.
Organ-Comes together to start working and the leg starts to develop.
Organ Sys.-The part grows back into its organ system.
Organism-The roach would be fully healed.

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We are able to study human anatomy and physiology through a cockroach experiment because the roach is able to display the principles of complementarity as well as set a good example for the big concepts such as anatomy, homeostasis, and levels of hierarchy.