Which of the following neurotransmitters does not belong to the class of small m

Question

Which of the following neurotransmitters does not belong to the class of small molecule neurotransmitters?

A- Acetylcholine

B- Epinephrine

C- Glycine

D- Endorphin peptide

Which of the following body parts are ipsilateral to one another?

A- heart and diaphragm

B- vertebral column and digestive organs

C- right arm and right leg

C- right arm and left leg

D- head and right foot

The main neurotransmitter in the sympathetic division of the autonomic nervous system is…

A- Norepinephrine

B- Acetylcholine

C- GABA

D- Glycine

In the nervous system, the strength of the stimulus will affect …

A- The amplitude of the action potential

B- The frequency of the action potential

C- Both the amplitude and the frequency of the action potential

D- None of the above

Which of the following events triggers the generation of an action potential in a neuron?

A- Opening the voltage-gated K+ channels

B- Membrane depolarization to -50 mV

C- Closing of voltage-gated Na+ channels

D- Membrane depolarization to -55 mV

Resting membrane potential is generated in a neuron because…

A- Na+ and K+ concentrations are high inside the cell

B- Na+ concentration is high inside the cell and K+ is high outside the cell

C- Na+ concentration is high outside the cell and K+ is high inside the cell

D- Neuronal membrane has similar permeability to K+, Na+ and Cl-

E- None of the above

All of the following statements are correct concerning the leakage channels EXCEPT…

A- The channels are present in cell bodies

B- The opening of the channels produces an action potential

C- The channels randomly open and close

D- The channels are present in the dendrites

Acetylcholine exerts its effects on postsynaptic cells when it:

A- is broken down by enzymes in the synaptic cleft, and the end-products diffuse into the postsynaptic cell.

B- binds to specific receptors on the postsynaptic cell membrane and changes the permeability of the membrane to particular ions.

C- diffuses into the postsynaptic cell and changes the pH of the intracellular fluid.

D- actively transports ions from the synaptic cleft into the postsynaptic cell.

E- blocks specific receptors to which other neurotransmitters could attach.

Neurotransmitters are stored in synaptic vesicles that are located primarily in the…

A- Dendrites

B- Soma

C-Axon

D- Axon terminal

Which type of conduction is associated with unmyelinated axons?

A- Saltatory conduction

B- Continuous conduction

C- Saltatory and continuous conductions

D- None of the above

Explanation / Answer

D. Endorphin peptide. It belongs to neuropeptide group of neurotransmitters.

C. Right arm and right leg. Ipsilateral means occurring orobelonging to the same side of tge body .

A. Norepinephrine. It's the main neurotransmitter of sympathetic nervous system. Acetylcholine is the main neurotransmitter of parasympathetic nervous system.

B. The frequency of the action potential . When the stimulus increases the size of the action potential (that is amplitude) doesnt change, it is always the same but frequency gets affected.

D. Membrane depolarization to - 55mV. Resting action potential is - 70mV and itihas to depolarize to - 55mV to allow opening of Na+ channels.

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