Increased blood levels of carbon dioxide signal the brain to breathe.
The brain stem.
The brain stem is necessary to control all involuntary functions in the human body. Signals are sent up and down the brain stem that tell your heart to beat and your lungs to breathe.
Holding your breath increases levels of carbon dioxide in your body, which signals the brain to trigger the urge to breathe. Receptors in the body called chemoreceptors sense the changes in carbon dioxide levels and send signals to the brainstem, prompting it to initiate breathing.
Your brain will force you to breathe in
The brain stem
The human nose functions by detecting and processing odors in the air we breathe. The nose contains specialized cells that detect specific odors, sending signals to the brain for interpretation. The nasal passages also help filter, warm, and humidify the air before it reaches the lungs.
The electrical signals generated by the ears are sent to the brain via the auditory nerve for interpretation. The brain processes and interprets these signals to create the perception of sound.
the brain
An electrical charge is spread through your body... The brain sends an electrical current to the point of the nerve to tell the body of the event...
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The brain
Emotions are neural signals that tell the brain about the world around us. These signals tell the brain how to respond to the stimuli.