What is the approximate distance between pre- and postsynaptic cells in electrical synapses?

• 20 nm

• 10 nm

• 3.5 nm

• 1 nm

Which neurotransmitter is most commonly associated with memory formation and is used in Alzheimer's treatment?

• Dopamine

• Acetylcholine

• Serotonin

• Glutamate

Which type of neurotransmitter receptor uses a second messenger system?

• Ionotropic

• Metabotropic

• Voltage-gated

• Ligand-gated

Excessive glutamate signaling can lead to:

• Neuroprotection

• Neurotoxicity

• Improved memory

• Inhibited reflexes

How many neurons are in the human brain?

• 86 million

• 86 billion

• 860 billion

• 8.6 trillion

Neurons can transmit signals at speeds comparable to:

• A walking human

• A cheetah running

• A Formula 1 car

• A rocket launching

Which type of synapse allows signals to pass almost instantly?

• Chemical synapse

• Electrical synapse

• Metabotropic synapse

• Ionotropic synapse

What do neurons do while you sleep?

• Take a rest

• Fire and communicate

• Shut down

• Grow new synapses constantly

Your brain has more synaptic connections than:

• Grains of sand on Earth

• Stars in the Milky Way

• Leaves in a forest

• Water molecules in a raindrop

How fast can neurons transmit electrical signals?

• 10 meters/second

• 60 meters/second

• 120 meters/second

• 200 meters/second