Introduction: The nervous system controls and coordinates all the activities of animals. It is classified into two major types, namely the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS includes the brain and the spinal cord. The PNS includes neurons and ganglia. The primary tissue of this system is the nervous tissue.
Answer to Problem 1E
Correct answer: If you put your hand on a red-hot piece of metal, the immediate response of pulling it away would be an example of a reflex.
Explanation of Solution
Reflexes are automatic, rapid, preprogrammed, involuntary responses of a gland or muscle to a stimulus. It includes five components that are arranged in a reflex arc. These five components include receptor, sensory neuron, an integration center, motor neuron, and effector. The involuntary activities are facilitated by autonomic reflex arcs in response to a specific stimulus. Thus, when an individual puts his or her hand on a red-hot piece of metal, the sudden response of withdrawing the hand is an example of reflex.
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