A diffuse network of nerve pathways in the brainstem connecting the spinal cord, cerebrum, and cerebellum, and mediating the overall level of consciousness is the:

1. Hippocampus
2. Hypothalamus
3. Reticular activating system
4. Limbic system

Motor aphasia may result due to the lesion of:

1. Broca's area
2. Wernicke's area
3. the cingulate gyrus
4. the angular gyrus

When a person enters a dark room, in the rods of his eyes:

1. cGMP levels are high.
2. cGMP levels are low.
3. G protein is degraded.
4. An influx of Ca²⁺ ions is prevented.

As a sound grows in intensity while remaining at one frequency the basilar membrane:

1. vibrates more toward the base.
2. vibrates more toward the apex.
3. does not vibrate at all.
4. vibrates equally all along its length.

A drug acts as an inhibitor of acetylcholinesterase. Administration of this drug would lead to:
1. accumulation of acetylcholine in the synaptic cleft
2. accumulation of acetylcholinesterase in the synaptic cleft
3. muscle relaxation
4. repeated action potentials

Located in the lower portion of the frontal lobe, the Broca's area is primarily concerned with:

1. visual reflexes
2. motor speech
3. neural hearing
4. sensory impulses

The precentral gyrus in the parietal lobe is the primary:
1. sensory area
2. visual area
3. auditory area
4. motor area

The longest cranial nerve with a large number of parasympathetic fibers is:
1. phrenic
2. spinal accessory
3. vagus
4. thoracic

Odors can alter our moods:

1. Because sensory input from olfaction is routed through the limbic system.

2. Because odors act as neurotransmitters and alter brain chemistry.

3. Because odors are satisfying to our sense of hunger.

4. Odors do not alter mood.

The extraocular muscles are innervated by all the following cranial nerves except:
1. oculomotor
2. trochlear
3. abducens
4. optic