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Atom- Atoms are the basis of a chemical element. They are seen rushing in and out of neurons during action potentials. potassium and sodium are examples found in the action potential process.

Molecule- A group of atoms bound together. passive transport proteins that allow sodium and potassium into the cell during the resting membrane are an example of a molecule.

Organelle- An organized structure in a cell. The nucleus of a neuron where DNA is stored is an example of an organelle.

Cell- A structural unit in an organism. A neuron is a cell that transmits signals through the body.

Tissue- Grouped specialized cells. Cockroaches have special areas of regenerative tissues in the eye, antenna, circus, and leg.

Organ- A structure made of tissue that preforms a certain function. The heart circulates blood using pumps.

Organ System- A group of organs that perform a complex function. The digestive system removes waste and absorbs nutrients.

Organism- A being made up of organ systems. It uses these to complete tasks and maintain homeostasis. The cockroach is an example of an organism.

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Homeostasis is the ability maintain stable organ systems by regulating body functions.

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Atom- Atoms are made up of neutrons, protons, and electrons. In both human and cockroaches atoms are able to connect to each other to create the later levels of hierarchy.

Molecule- Molecules produce proteins and makeup organelles. the negatively charged proteins polarize the inside and outside of the cell in both humans and cockroaches.

Organelle- The axon terminals branch out of the neuron to send signals to neighboring neurons. This tribute is seen in both human and cockroach neurons.

Cell- The neuron’s cell body, dendrites, axon, and axon terminals allow the cell to transmit and receive signals throughout the body. These cells are found in both humans and cockroaches. The action potential in each cell can be studied in cockroaches.

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Humans- When the body is exposed to a cold environment it shivers to increase body temperature. When the Environment is hot the body sweats to lower body temperature.

Cockroaches- When a leg is cut or ripped off neurons send messages back forth to the brain to incite regrowth in regenerative tissues.

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Tissue- nervous tissue is made up of sensory and motor neurons. These able to sense stimulus and send and receive signals. The nervous tissue in a c cockroach can be used to study how these signals are sent in humans.

Organ- The sclera of the eye is made of a tough tissue to protect the eye. The sheep eye has similar attributes to the human eye: sclera, cornea, iris, etc. This allows us to study sheep eyes and apply finding to humans.

Organ System- The nervous system is made up of sensory nerves located on the outer portions of the organism, these send signals to the central nervous system. This structure allows external stimuli to be absorbed and processed. The cockroach has a CNS and PNS system similar to humans, this allows us to study the communication within the system.

Organism- The accumulation of all previously stated structure-function relationships.