Neuroplasticity replaced the former "static organ" model of brain functioning through recognition that in response to changes in behavior, environment, or even injury to the brain, the brain's functions, structure and shape can change. This plasticity occurs at both the synaptic and non-synaptic levels.

The limbic system is composed of the septum, cingulate gyrus, hypothalamus, and amygdala, plus other more minor formations. This system is particularly associated with the formation of memory.

All of the answers lead to regulation of neurotransmitters in the brain, thus leading to regulation of neural impulses. A combination of releasing inhibitory and excitatory neurotransmitters and also removing them from the synapses leads to the diverse neural impulses in the brain.

The autonomic nervous system is made up of nerves that connect to the heart, blood vessels, smooth muscles, and glands. The autonomic nervous system controls automatic and involuntary physiological arousals that occur when people experience emotions. In this case, Angie is experiencing a lot of fear or other emotions due to the break in and her autonomic nervous system is hijacking her body, preparing her for a possible fight or flight situation. 

Like the autonomic nervous system, the somatic nervous system is part of the peripheral nervous system; however, its function is for voluntary skeletal muscles and sensory receptors. The central nervous system consists of the brain and spinal cord, but doesn't include the peripheral nerves that made Angie react the way she did. The basic nervous system is not a real system. 

Research has shown that different parts of the brain handle different tasks. Typically, the right hemisphere of the brain handles most visual-spatial functions while the left hemisphere handles language. Exceptions to this rule are when a person is born or develops some sort of brain abnormality or damage. In this case, the brain often adapts so that one hemisphere takes over the job of the other one. 

The corpus callosum is a large band of fibers that relays signals between the two hemispheres of the brain.

Endorphins—released during exercise, sex, and excitement—work in relieving pain symptoms. Analgesics, painkillers, are developed to have similar neurological reactions with longer-lasting effects.

The occipital lobe is important for the sense of sight, and contains areas such as the primary visual cortex (i.e. V1). The temporal lobe is important for the sense of hearing. The parietal lobe is important for integrating sensory information of all types. Last, the frontal lobe is important for planning and decision-making.

The sympathetic nervous system is responsible for the "fight or flight" response, which is generally due to a rush of adrenaline that allows the body to respond maximally to a potential threat. 

While interesting, the other answers are incorrect. The parasympathetic nervous system is incorrect because this is the system that counters the body's stress response produced by the sympathetic nervous system. The central nervous system is responsible for the nerves within the skeletal structure as well as motor movements. It consists of the brainstem and spinal cord. Last, the somatic nervous system controls voluntary muscle movements. 

Melanin is a pigment found in the skin and eyes, but also in the brain. It is not to be confused with melatonin, a hormone and neurotransmitter. Acetylcholine is a neurotransmitter associated with, among other things, the stimulation of muscle contractions. Norepinephrine is both a hormone and a neurotransmitter and helps return the body to homeostasis after the release of epinephrine (adrenaline). Last, glutamate is a neurotransmitter associated with nearly all (about 90%) synapse connections.