A major coordinating center for sensory and motor signaling in the human brain is shown in the given sagittal section by the letter:
     
1. A
2. B
3. C
4. D

In the resting stage, the axonal membrane:
1. is more permeable to sodium than to potassium ions
2. is more permeable to potassium than to sodium ions
3. is equally permeable to both sodium and potassium ions
4. is impermeable to both sodium and potassium ions

Sympathetic stimulation would lead to all of the following except:
1. Dilation of pupil
2. Bronchoconstriction
3. Increased heart rate
4. Decreased gland secretions

Which layer of human retina stores Vitamin A?
1. Pigment layer
2. Rods 
3. Layer of bipolar cells
4. Inner plexiform layer

Which region of the diencephalon controls the ANS and endocrine system and body temperature?
1. epithalamus

2. hypothalamus

3. thalamus

4. infundibulum

The autonomic division of the peripheral nervous system does not innervate:
1. visceral organs
2. exocrine glands
3. skeletal muscle
4. endocrine glands

The reflex arc ends at:
1. sensory neuron
2. motor neuron
3. effector
4. receptor

The brain stem does not include:
1. medulla
2. pons
3. midbrain
4. cerebral cortex

All the following statements regarding the action potential are true except:
1. Only a relatively small number of ${\mathrm{Na}}^{+}$ and ${\mathrm{K}}^{+}$ ions actually diffuse across the membrane.
2. This event includes both positive and negative feedback loops.
3. The ${\mathrm{Na}}^{+}$/${\mathrm{K}}^{+}$ pumps are directly involved in creating the action potential.
4. During an action potential, the ${\mathrm{Na}}^{+}$ and ${\mathrm{K}}^{+}$ total concentration are not significantly changed.

Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cell of the following. Which of the cells are least likely to be replaced by new cells -

1. Osteocytes

2. Liver cells

3. Neurons

4. Malpighian layer of the skin