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(Not pictured: hindlegs, because already surgically removed them. But they go under the midlegs.)

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The cockroach's lack of pain receptors in the body do not allow for the roach to feel the pain that it is being put through. For example, if in the event of an emergency situation and their homeostasis is off balance, such as when they get injured, they have the capability of eating their leg off to restore that homeostasis. Therefore, they do not have pain receptors so that they can easily numb themselves to not feel the pain of losing a leg. Also, due to their open circulatory system, they are able to leave about a week without their head, since they have other segments to breathe through other than their nose or mouth. Therefore, even without a head, the homeostasis is maintained because of the strength of their entire body instead of being dependent on a certain organ.

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Order: Molecular, Cellular, Tissue, Organ, Organ System, Organism.

This order can be displayed on the cockroach, because it shows that no matter what kind of living creature you are, a human or a bug, the levels of hierarchy are still the same in that the molecules are the smallest and the organ system is the biggest, other than the actual organism itself. These models allow us to understand how complex our body systems really are, and that within every layer, there are even smaller molecules, cells, or tissues to make up each organ and each organ system.

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Levels of Hierarchy - Organ and Organ System (biggest)

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Levels of Hierarchy - Organ and Organ System (biggest)

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One of the two organs of the nervous system is but of course, the brain. The brain works as the powerhouse to run by every single signal, impulse, and thought that might run through your system on a day to day basis. The different layers and sections of the brain allow for the neurons to separate between what their function (i.e. motor neuron goes to the motor cortex) so that it creates a faster and more efficient way of sending out signals.  The nervous system as a whole: the brain, the spinal cord, and all of the nerve endings throughout your muscles and body, are durable and also thin to ensure that there will always be a way to reach that part of the body. The spinal cord is also surrounded by bones to guarantee protection so that each part of your body receives the signals from your brain and down to the spinal cord.

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Nervous tissue is the basis of the support within the nervous system of the body. This includes the support cells, or neuroglia, to support, insulate, and protect the neurons. Their strong but flexible exterior allows for movement throughout the body system, so that the messages can get passed on.

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The motor neuron is the neuron in charge of movement throughout the nervous system. The motor neuron, with its long branch-like dendrites and long but strong axon allow the motor neuron to transport impulses from the nervous system to the muscles or glands.

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Levels of Hierarchy - Molecular (smallest)

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Levels of Hierarchy - Molecular (smallest)

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The astrocyte is one of the neuroglia located inside of the motor cells of the body. This cell works to control the chemical environment of the brain. Their strong exterior and long dendrites help them to form barriers between the capillaries and the neurons.

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After preforming the surgery on the cockroach's leg, we were able to connect it to the spike box, where we tested the action potential via the frequency spikes in the cockroach's detached leg. In the recording, the increasing and decreasing amplitude displays how the wand distributed the electrical charge that we rubbed against the hairs on his leg trigger the nerve to receive the touch.