Final answer:
The limbic system is primarily involved in mood regulation, so the instructor would likely mention that stimulation of the limbic system affects mood (C). It is closely associated with emotional processing and can influence physiological responses as part of an emotional reaction.
Step-by-step explanation:
The physiology instructor discussing the limbic system would say that stimulation of this area affects C) Mood. The limbic system, which includes the hippocampus and the amygdala, plays a crucial role in emotional processing. Increased activity in the amygdala, for instance, is associated with learning fear and is observed in individuals who have mood disorders. Additionally, the limbic system is involved in affecting various physiological responses associated with emotions, such as changes in heart rate and respiration, which are part of the body's fight or flight response initiated by the sympathetic nervous system. It's important to note that while the limbic system contributes to emotional responses, it does not directly control intelligence, reflexes, or heart rate in a non-emotional context. Rather, emotions can lead to secondary changes in these physiological processes as part of an integrated response.