All of the following are functions of the peripheral nervous system except
it interprets signals from the external environment
it sends signals to the internal organs
it receives messages from the central nervous system
it sends messages directly to muscles and glands

The right option is; it interprets signals from the external environment  

The peripheral nervous system (PNS) is made up of all parts of the nervous system, except the brain and spinal cord (parts of the central nervous system). The peripheral nervous system functions as a channel through which neural signals are transferred from and to the central nervous system. Two types of neurons (sensory and motor neurons) functions in the PNS. The motor neurons transfer neural signals from the central nervous system directly to various muscles, glands, and organs (effectors) throughout the body.

Based on the question, all of the following are functions of the peripheral nervous system except it interprets signals from the external environment.

One of the structures of the Nervous System is the peripheral nervous system. The other one is called the Central Nervous System.

The peripheral nervous system encompasses all the neurons that exist outside the brain and spinal cord. In other words, it comprises all the nerves that are connected to the spinal cord and the brain, which are parts of the Central Nervous System, and further advance to other parts of the body as well as muscles and organs

The peripheral nervous system is structured into two systems: (a) the autonomic nervous system; (b) the somatic nervous system.

Primarily, one of the functions of the peripheral nervous system is connect the brain and spinal cord to the rest of the body and the external environment. This process is completed through nerves that process information from sensory organs in the tongue, ears, eyes, and nose, as well as pain receptors and stretch receptors in glands, muscles, and other internal organs.  

Another function of the peripheral nervous system also includes controlling the release of secretions from most exocrine glands. The peripheral nervous system also stimulates the muscles surrounding sense organs, so it is involved in speaking, chewing, swallowing and biting.  

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