Biology Test Neuroscience Fundamentals 5

Question 1

Which neurotransmitter is most associated with reward, motivation, and reinforcement learning pathways in the brain?

Accepted Answer

Dopamine

Answer

Dopamine neurons in the ventral tegmental area project to the nucleus accumbens and prefrontal cortex, forming the mesolimbic reward pathway central to motivation and reinforcement.

Question 2

What name is given to the specialized junction between a motor neuron and a skeletal muscle fiber?

Accepted Answer

Neuromuscular junction

Answer

The neuromuscular junction is the chemical synapse where motor neurons release acetylcholine onto nicotinic receptors on the muscle end plate, triggering contraction.

Question 3

Which type of glial cell acts as the resident immune cells of the central nervous system?

Accepted Answer

Microglia

Answer

Microglia are CNS-resident macrophages derived from the yolk sac; they survey the brain for pathogens and damage and respond by phagocytosis and inflammatory signaling.

Question 4

Wernicke's area, associated with language comprehension, is located in which brain region?

Accepted Answer

Left temporal-parietal junction

Answer

Wernicke's area lies at the junction of the left temporal and parietal lobes (posterior superior temporal gyrus) and is critical for understanding spoken and written language.

Question 5

What is the role of GABA in the adult brain?

Accepted Answer

Primary inhibitory neurotransmitter

Answer

GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the adult CNS; it hyperpolarizes neurons by increasing Cl⁻ conductance through GABA-A receptors.

Biology Practice Test

Biology Practice Test

Biology Test Neuroscience Fundamentals 5