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That would be the skin.

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Q: Which organ system comes in contact with the external environment?
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What does your immune system form when it comes in contact with an allergen?

antibodies are formed when the immune system comes in contact with the allergen.


Where does the energy and matter come from in an environment?

THe energy ultimately comes from the sun, from sun to plants through photosynthesis where it is then eaten by other organisms. Also, energy trapped inside the earth ultimately came from the sun Matter comes in a cycle, so it only ever changes when an environment comes into contact with another environment or system.


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i believe it is the "Somatic" Nervous System. Since the Somatic is Voluntary and all. The Somatic is the part of the Nervous System that is responsible for consciousness movement and action. However, some systems in the Somatic are still involuntary, like reflexes. The Somatic Nervous System is part of the Peripheral Nervous System.


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In biological terms, an internal and external stimuli are distinguishable by the source. For instance, hunger triggers the need to eat. This is an internal stimuli, as the body is stating it needs food. An external stimuli would be feeling the pinch of the needle when donating blood, or feeling the effects of the sun in the form of sunburn.


Is it true the nerve from the brain receives information about the environment and sends it to the brain?

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Which structure in the digestive system comes to direct contact with the circulatory system for transfer of nutrients into the blood?

The small intestine is the answer your looking for.


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What organ system helps you sense things in the world around you?

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