When a patient with a febrile illness begins to shiver, the nurse understands that which of the following has occurred?
A) A rise in body temperature has been sensed by the central thermoreceptors.
B) A drop in body temperature has been sensed by the central thermoreceptors.
C) The core temperature has risen above the set point range.
D) The core temperature has fallen below the set point range.
D) The core temperature has fallen below the set point range.
Explanation: A) Peripheral thermoreceptors that detect a drop in core temperature below the set point range transmit signals to the primary shivering center in the posterior hypothalamus. Subsequently, efferent impulses from the primary shivering center descend through pathways in the brainstem and spinal cord, resulting in skeletal muscle contractions.
B) Central thermoreceptors are heat sensitive and contain few cold sensitive receptors. In contrast to central thermosensitive receptors, most peripheral thermoreceptors are cold-sensitive, making them more responsive in stimulating cold-defense mechanisms.
C) Peripheral thermoreceptors that detect a drop in core temperature below the set point range transmit signals to the primary shivering center in the posterior hypothalamus. Subsequently, efferent impulses from the primary shivering center descend through pathways in the brainstem and spinal cord, resulting in skeletal muscle contractions.
D) Peripheral thermoreceptors that detect a drop in core temperature below the set point range transmit signals to the primary shivering center in the posterior hypothalamus. Subsequently, efferent impulses from the primary shivering center descend through pathways in the brainstem and spinal cord, resulting in skeletal muscle contractions.
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