In the peripheral nervous system, the nerves that arise from spinal cord and brain are called:
Correct answer: D. Both A and B respectively
- A. Spinal nerves
- B. Cranial nerves
- C. Temporal nerves
- D. Both A and B respectively
Explanation
The explanation for this question is as follows: Peripheral Nervous System (PNS):It comprises of sensory neurons and motor neurons, which may form ganglia and the nerves. Ganglia are the concentrations of cell bodies of neurons. The nerves are the bundles of axons or dendrites, bounded by connective tissue.They may be sensory motor or mixed nerves depending upon the direction of impulse they conduct. In humans, there are 12 pairs of nerves, which arise from the brain, or lead to the brain. These nerves are called cerebral or cranial nerves. Some of these nerves are sensory, some motor, and some are mixed. From the spinal cord 31 pairs of spinal nerves arise or lead to spinal cord. All these nerves are mixed having fibres of both sensory and motor neurons.
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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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