The reticular formation connects the brain and the spinal cord. The reticular function is involved in the heartbeat but does not regulate arousal. Thus, option B is correct.
The reticular formation (RF) is the part of the brainstem that are complex pathways that connects the brain and the spinal cord. It is made of complex structures that involve the nerve cells and nuclei of the brainstem.
It is involved in several activities that regulate and coordinates cardiovascular control, habituation, pain regulation, consciousness, sleep cycle, etc.
The arousal is regulated by the amygdala of the temporal lobe situated in the hypothalamus part of the brain and does not contain any reticular formation.
Therefore, option B. arousal regulation is not a function of the reticular formation.
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