The peripheral nervous system contains all of the following except .

Explanation:

The nervous system is divided into two parts: central nervous system formed by the brain and spinal cord and peripheral nervous system that is formed by nerves and nerve ganglia that extend outside the central nervous system. The main function of thenervous system Peripheral is to connect the central nervous system with the limbs and organs. It lacks protective bone lining which differentiates it from the central nervous system that is enveloped by the skull and spine.

In the human species it is composed of 12 pairs of cranial nerves and 31 pairs of spinal nerves, thus giving a total of 43 pairs of nerves. Each of the nerves follows a defined path and innervates a specific sector of the body. The division between central nervous system and peripheral nervous system is anatomical or structural. From a functional point of view, the peripheral nervous system can be divided into a somatic nervous system that is controlled voluntarily and an autonomous nervous system that works involuntarily or automatically.

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so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

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tobey

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.