Speech and other language abilities are lateralized brain functions, meaning they are all located on one side of the brain. For most people, the left hemisphere controls language.

The parasympathetic nervous system activates the relaxation, or "rest-and-digest," response. Roughly the opposite of the "fight-or-flight" response of the sympathetic nervous system, the relaxation response involves restoration of energy reserves and other "peace time" functions, such as repair and reproduction.

Creativity can be described loosely as the application of novel solutions and possibilities to some aspect of human endeavor. Creativity is easy to identify but notoriously difficult to measure.

The "master gland" of the body, your pituitary gland -- located at the base of your brain -- secretes hormones that control the function of other glands throughout your body. It controls a range of physiological processes, including pubertal development and reproductive health, muscle growth and cellular metabolism.

Serotonin and melatonin are both hormones that regulate various human functions such as sleep, appetite and mood. Serotonin, which is produced in the body, is known as a neurotransmitter; this means it is responsible for sending messages between nerve cells.

Emotions, like fear and love, are carried out by the limbic system, which is located in the temporal lobe. While the limbic system is made up of multiple parts of the brain, the center of emotional processing is the amygdala, which receives input from other brain functions, like memory and attention.

Sight is a complex function of the brain that extends from the front to the back of the head. To produce sight, the eyes capture information and send it through the optic nerve to be processed by the occipital lobe.

Acetylcholine is a major neurotransmitter in the nervous system. It is required for memory, concentration and focus, and it also plays a role in muscle coordination. Acetylcholine is not a component of foods; instead, it is built from choline. The more choline you eat, the more acetylcholine you can produce.

Many different things can affect brain function, from infection, to trauma, to metabolic imbalances, but only a few of them are deadly. Most of these deadly diseases are equal opportunity, infecting just as many people from First World countries as they do from underdeveloped nations.

Lithium aspartate and lithium orotate are gaining recognition as supplements that can help decrease signs of brain aging, slow dementia, and fight depression and addiction. Lithium is a mineral that has long been used in the treatment of bipolar disorder, also known as manic depression.

The brain is the most complex part of the body. It controls our movements, communication, decisions and emotions, as well as our organs.

MayoClinic.com describes the brain as “containing billions of nerve cells arranged in patterns that coordinate thought, emotion, behavior, movement and sensation.” Each part of the brain is responsible for a specific function, and they all work together.