Can you explain the Peripheral Nervous System?

The peripheral nervous system (PNS) resides or extends outside the central nervous system (CNS), which consists of the brain and spinal cord. The main function of the PNS is to connect the CNS to the limbs and organs. Unlike the central nervous system, the PNS is not protected by bone or by the blood-brain barrier, leaving it exposed to toxins and mechanical injuries. The peripheral nervous system is divided into the somatic nervous system, autonomic nervous system and the sensory system.

By direction

There are three types of directions of the neurons:

* Sensory system by sensory neurons, between the sensory and motor neurons. However, there are relay neurons in the CNS as well .

By function

By function, the peripheral nervous system is divided into the somatic nervous system, autonomic nervous system and the enteric nervous system. The somatic nervous system is responsible for coordinating the body movements, and also for receiving external stimuli. It is the system that regulates activities that are under conscious control. The autonomic nervous system is then split into the sympathetic division, parasympathetic division, and enteric division. The sympathetic nervous system responds to impending danger or stress, and is responsible for the increase of one's heartbeat and blood pressure, among other physiological changes, along with the sense of excitement one feels due to the increase of adrenaline in the system. The parasympathetic nervous system, on the other hand, is evident when a person is resting and feels relaxed, and is responsible for such things as the constriction of the pupil, the slowing of the heart, the dilation of the blood vessels, and the stimulation of the digestive and genitourinary systems. The role of the enteric nervous system is to manage every aspect of digestion, from the esophagus to the stomach, small intestine and colon.

Endocrine System

The endocrine system is a system of glands that involve the release of extracellular signaling molecules known as hormones. The endocrine system is instrumental in regulating metabolism, growth, development and puberty, and tissue function and also plays a part in determining mood. The field of study that deals with disorders of endocrine glands is endocrinology, a branch of the wider field of internal medicine.

Function

The endocrine system is an information signal system much like the nervous system. However, the nervous system uses nerves to conduct information, whereas the endocrine system mainly uses blood vessels as information channels. Glands located in many regions of the body, for example the testis, release into the bloodstream specific chemical messengers called hormones. Hormones regulate many functions of an organism, including mood, growth and development, tissue function, and metabolism.

Peripheral Nervous System Consists Of

The nervous system has two divisions: the central nervous system and the peripheral nervous system. The central nervous system includes the brain and spinal cord. It processes incoming sensory information and sends outgoing motor commands...

The peripheral nervous system includes all neural tissue outside the central nervous system. It is divided into motor and sensory systems. Impulses go to the central nervous system through sensory nerves and are carried away from it by the motor nerves. The motor system is further divided into the somatic (or skeletal) nervous system and the autonomic nervous system. The somatic, or skeletal, motor system allows voluntary control over skeletal muscle with a few exceptions. The autonomic nervous system is largely involuntary and controls cardiac and smooth muscles and glands.

The brain and the spinal cord together make up the central nervous system, which communicates with the rest of the body through the peripheral nervous system. The peripheral nervous system consists of 12 pairs of cranial nerves extending from the cerebrum and brain stem; a system of other nerves branching throughout the body from the spinal cord; and the autonomic nervous system, which regulates vital functions not under conscious control, such as the activity of the heart muscle, smooth muscle (involuntary muscle found in the skin, blood vessels, and internal organs), and glands.

The peripheral nervous system (PNS) resides or extends outside the central nervous system (CNS), which consists of the brain and spinal cord.

The endocrine system is a system of glands that involve the release of extracellular signaling molecules known as hormones.

Your Peripheral nervous system PNS are your limbs and your central nervous system CNS is your brain.

Endocrine system is all the hormones in your body.

The nervous system consists of an almost circuit :)

stimulus - receptor - sensor - CNS (central nervous system) - effector - response.

this consists of a network of sensory and motary neurones.

If you ask others to do your homework, you will learn nothing. How this is answered depends on a lot of things, like what course are you taking, at what level, what kind of answer does the teacher expect, what are the instructions? Volumes have been written on these subjects, far too complex to address in this forum.