The system, which consists of nerves arising from the brain and spinal cord, is called:
Correct answer: A. Peripheral nervous system
- A. Peripheral nervous system
- B. Central nervous system
- C. Autonomic nervous system
- D. None of the above
Explanation
The peripheral nervous system (PNS) is the part of the nervous system that consists of the nerves and ganglia outside of the brain and spinal cord. The main function of the PNS is to connect the central nervous system (CNS) to the limbs and organs, essentially serving as a communication relay going back and forth between the brain and the extremities. Unlike the CNS, the PNS is not protected by the bones of the spine and skull or by the blood-brain barrier, which leaves it exposed to toxins and mechanical injuries. The peripheral nervous system is divided into the somatic nervous system and the autonomic nervous system.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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