SYNAPTIC TRANSMISSION

Which of the following differentiates electrical synapse from a chemical synapse?

• It can transmit signals farther than chemical synapse

• It uses vesicles to transmit electrical signals

• It is made up of proteins called connexons

• Transmission delay is longer

Which of the following ions is mainly intracellular?

• Sodium

• Potassium

• Chloride

• Bicarbonate

The resting membrane potential of a spinal motor neuron is:

• -65 mV

• -55 mV

• 65 mV

• 55 mV

Which of the following neurotransmitters is mainly excitatory?

• GABA

• Serotonin

• Glutamate

• Glycine

Neurotoxins like Botulinum A affect which structure of the SNARE complex.

• Synaptogamin

• Synaptobrevin

• Syntaxin

• SNAP-25

Which ion mainly exocytosis of vesicles?

• Sodium

• Potassium

• Calcium

• Chloride

Which of the following causes inhibition?

• Opening of sodium channels

• Decreased conduction of potassium channels

• Changes in internal metabolism that increases excitatory receptors

• Opening of chloride channels

Which of the following is a neuropeptide?

• Bradykinin

• Aspartate

• Epinephrine

• Nitric oxide

Which part of synaptic transmission does tetanus toxin inhibit?

• Sodium channel opening

• Acetylcholine release

• Acetylcholinesterase breakdown of acetylcholine

• Calcium channel opening

This is a phenomenon wherein when multiple presynaptic terminals are stimulated at the same time, the EPSP from each presynaptic terminal adds up to depolarize the cell.

• Facilitation

• Temporal summation

• Spatial summation

• Post-tetanic potentiation