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Niacin assists in the functioning of the digestive system, skin, and nerves. It is also important for the conversion of food to energy.
Somatic system
The skin is an organ by itself, but the circulatory system and nervous system both have direct connections with the skin (through capillaries in the case of circulatory and nerve endings in the case of nervous system.)
NERVOUS system
Nervous systemIt is the integumentary system.Your skin is referred to as the epidermis.
The skin contains receptors for temperature, pressure and pain.
Both the skin and nervous system.
The brain belongs to the Central Nervous System(CNS) of the human Nervous System.
Skin and nervous system of the organism.
The nervous system is influenced mainly by the brain, brain stem, spinal cord and special cells called neurons. The brain and spinal cord are the two main components of the central nervous system (although the spinal cord isn't technically an organ). The skin could also be considered an important organ of the nervous system
Somatic nerves from the somatic nervous system