Synaptic Transmission Study Question Bank

Dive into an in-depth exploration of synaptic transmission with our comprehensive question bank, designed to enhance your understanding and prepare you for academic success.

Edited by Me.bot Editorial Team Questions: 16 September 26, 2024

Character Test

1. Sequential excitatory postsynaptic potentials (EPSPs) from a given presynaptic terminal will be most effective at bringing a postsynaptic neuron to threshold when:

Inhibitory inputs are minimal

EPSPs arrive very close together in time

2. If an inhibitor of acetylcholinesterase is applied to the neuromuscular junction, the muscle contracts in response to the first action potential in the motor neuron but is refractory to the additional stimuli. What is the basis for the refractoriness of the skeletal muscle action potential?

Continued binding of ACh to receptors causes increased K+ conductance

Continued binding of ACh to receptors increases inactivation of Na+ channels

3. During an EPSP, there is an increased permeability to both K+ and Na+. How would the amplitude of the EPSP compare if there was also an increase in membrane permeability to Cl-?

The amplitude would increase

The amplitude would decrease

4. The influx of Ca2+ into the presynaptic terminal during synaptic transmission is due primarily to what?

Depolarization of membrane potential

A voltage-activated increase in membrane gCa

5. Which describes a feature common to synaptic transmission in the CNS and at the neuromuscular junction?

An action potential in a presynaptic neuron triggers an action potential in the postsynaptic neuron

Synaptic transmission can be modulated by presynaptic inhibition

6. Nicotinic ACh receptors are responsible for which of the following events?

Producing the skeletal muscle end-plate potential

Decreasing the rate of phase-4 depolarization at the SA node

7. Which of the following statements about synaptic transmission at the neuromuscular junction is true?

It is enhanced by acetylcholine release from the alpha motorneuron

It is depressed by increased parasympathetic nerve activity

8. Periodic hyperkalemic paralysis is characterized by high potassium concentration and muscle weakness. Which of the following is likely to cause muscle weakness as a result of increased extracellular potassium concentration?

Inactivation of sodium channels in muscle cells

Decreased potassium conductance in muscle cells

9. The correct temporal sequence of events at the neuromuscular junction is what?

Action potential in the motor nerve; uptake of Ca2+; release of acetylcholine

Release of acetylcholine; action potential in the motor nerve; action potential in the muscle

10. A person with myasthenia gravis notes increased muscle strength when treated with an acetylcholinesterase (AChE) inhibitor. The basis for the improvement is due to the increase in which of the following?

The level of ACh at the muscle end plates

The number of ACh receptors on the motor end plates

11. At the muscle end plate, acetylcholine (ACh) causes the opening of which of the following?

Na+ and K+ channels; depolarization to a value halfway between Na+ and K+ equilibrium potentials

Na+ channels and depolarization toward the Na+ equilibrium potential

12. An inhibitory post-synaptic potential changes the membrane potential in which of the following mechanisms?

Hyperpolarization of the postsynaptic membrane by opening Cl- channels

Depolarization of the postsynaptic membrane by opening Na+ channels

13. Which of the following is an inhibitory neurotransmitter in the central nervous system (CNS)?

γ-aminobutyric acid (GABA)

Glutamate

14. Which correctly associates a neurotransmitter with one of its characteristics?

Dopamine is synthesized from the amino acid tyrosine.

GABA is the neurotransmitter that mediates long-term potentiation

15. The NMDA receptor is activated by what neurotransmitter?

Glutamate

Glycine

16. Presynaptic inhibition of the central nervous system affects the firing rate of alpha motorneurons by which of the following mechanisms?

Decreasing the frequency of action potentials by the presynaptic nerve ending

Increasing the Cl- permeability of the presynaptic nerve ending

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Frequently Asked Questions

What is the Synaptic Transmission Study Question Bank?

The Synaptic Transmission Study Question Bank is a curated collection of questions focusing on the mechanisms of synaptic transmission, aimed at helping students prepare and excel in their exams.

How can the Synaptic Transmission Study Question Bank help me?

By using the Synaptic Transmission Study Question Bank, you can deepen your understanding of key concepts, practice critical thinking skills, and assess your knowledge to ensure you're well-prepared for exams.

What topics are covered in the Synaptic Transmission Study Question Bank?

The Synaptic Transmission Study Question Bank covers a range of topics including neurotransmitter release, synapse structure, signal transmission, and the role of various ions and receptors in synaptic function.

Is the Synaptic Transmission Study Question Bank suitable for all levels of learners?

Yes, the Synaptic Transmission Study Question Bank is designed to cater to different learning levels, from beginners who are new to the subject to advanced students looking to solidify their knowledge.

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