Neuroscience Basics Quiz

Grade 12 · Science · Quiz

Test your knowledge of neural anatomy, signal transmission, and brain function.

Questions

1. Which part of a neuron generates and transmits the action potential?

   1. Dendrites
   2. Soma (cell body)
   3. Axon
   4. Nucleus
   Show answer

   Answer: Axon

   Action potentials are initiated at the axon hillock and propagate along the axon; dendrites and soma receive and integrate graded potentials, not conduct action potentials.

2. The blood-brain barrier is primarily formed by:

   1. Microglia
   2. Tight junctions between capillary endothelial cells
   3. The meninges
   4. Schwann cells
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   Answer: Tight junctions between capillary endothelial cells

   Tight junctions between brain capillary endothelial cells restrict paracellular transport, forming the BBB; astrocyte end-feet also contribute to its function.

3. Which neurotransmitter is primarily released at the neuromuscular junction?

   1. Dopamine
   2. Serotonin
   3. Acetylcholine
   4. Norepinephrine
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   Answer: Acetylcholine

   Acetylcholine (ACh) is the neurotransmitter released by motor neurons onto skeletal muscle cells at the neuromuscular junction, triggering muscle contraction.

4. Loss of dopaminergic neurons in the substantia nigra is associated with which disease?

   1. Alzheimer's disease
   2. Multiple sclerosis
   3. Parkinson's disease
   4. Epilepsy
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   Answer: Parkinson's disease

   Parkinson's disease results from progressive loss of dopaminergic neurons in the substantia nigra pars compacta, disrupting the basal ganglia circuit and impairing movement initiation.

5. Which division of the autonomic nervous system is responsible for the 'fight or flight' response?

   1. Somatic nervous system
   2. Parasympathetic division
   3. Sympathetic division
   4. Enteric nervous system
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   Answer: Sympathetic division

   The sympathetic division activates the fight-or-flight response by releasing norepinephrine and epinephrine, increasing heart rate, dilating airways, and redistributing blood flow.

6. Long-term potentiation (LTP) is thought to be a cellular mechanism underlying:

   1. Muscle contraction
   2. Learning and memory
   3. The refractory period
   4. Axonal myelination
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   Answer: Learning and memory

   LTP is a long-lasting increase in synaptic strength following high-frequency stimulation, involving AMPA receptor insertion and NMDA receptor activation; it is the leading cellular model of memory formation.

7. The cerebellum is responsible for complex reasoning and decision-making.

   Show answer

   Answer: False

   The cerebellum coordinates movement, balance, and fine motor control; complex reasoning and decision-making are primarily functions of the prefrontal cortex.

8. The myelin sheath in the peripheral nervous system is produced by _____ cells.

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   Answer: schwann

   Schwann cells wrap around axons in the PNS to form the myelin sheath; in the CNS, oligodendrocytes perform this function.

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