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Which structure in the brain is responsible for arousal and maintenance of consciousness?

A The reticular activating system

The reticular activating system (RAS) is primarily responsible for the arousal and maintenance of consciousness. The midbrain is a part of the brainstem, which has a crucial role in the regulation of autonomic functions like breathing and heart rate. The diencephalon consists of the hypothalamus and thalamus in the middle part of the brain between the cerebrum and midbrain. It plays a huge role in regulating and coordinating sensory information and hormonal secretion from the hypothalamus. The limbic system tends to the major instinctual drives like eating, sex, thirst, and aggression.