The nervous system.
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The two major cell populations specialized for this function are neurons, which receive and transmit electrical signals, and neuroglia, which serve supporting roles in maintaining the environment for proper neuronal function and communication. Together, they form the cellular framework of the nervous system, responsible for receiving stimuli and conducting waves throughout the body.
The organ receives stimuli from the skin and mucous membranes.
The nervous system is responsible for transmitting information throughout the body and coordinating responses to external and internal stimuli, similar to the role of the endocrine system. Both systems help regulate and maintain the body's overall function and homeostasis.
The respiratory system is responsible for bringing gases into and out of the body. It could not perform this exchange, however, without the circulatory system.
Your nervous system, specifically sensory receptors, collect information from inside your body. These receptors detect various stimuli such as temperature, pressure, and internal organ function and send this information to your brain for processing.