18 BIOL x edu/d2l/le/content/157473/viewContent/1681261/Vievw Feld of Hope BB, S

Question

18 BIOL x edu/d2l/le/content/157473/viewContent/1681261/Vievw Feld of Hope BB, Skinner , psyche BF Skinner lope, an Tobacco plants produce nicotine, and insects of most species die when they eat it. Some, like the tobacco hornworm (a moth caterpillar), do not. Despite the obvious role of nicotine as an insecticide, many people still smoke and their neurons are bathed in nicotine. People are often attracted to smoking and become addicted to it because nicotine mimics acetylcholine. Therefore nicotine affects neuromuscular junctions. What would you correctly predict in each of the following situations? the rate at which sodium ions (Na) enter the [1] Nicotine would post-synaptic neuron (after the synapse) through sodium channels a) increase b) decrease c) have no effect on. [2] Addition of nicotine to a synapse would result in activity (action potentials/neurotransmitter release) at the pre-synaptic membrane and activity (action potentials) at the post-synaptic membrane. a) more, more b) more, less c) the same, more d) the same, less e) the same, the same [3] What would you correctly predict about the insects that die because they eat tobacco? a) All those that die would appear first to have seizures. b) All those that die would appear first to be paralvzed. 14 oe@

Explanation / Answer

If nicotine acts like acetylcholine then acetylcholine helps in changing the shape of membrane thus allowing the more influx of sodium ions.

1. Answer is a) increase.

2. Answer is c) the same,more. We know nicotine will help in movement of sodium ions. Addition of nicotine to a synapse would result in the same activity at the pre-synaptic membrane and more activity at the post-synaptic membrane.

3. Nicotine disrupts the neurotransmitters in insects thus proving it to be fatal. The error messages are send to muscles and even heart. The answer is option c. Some of the insects before dieing tend to be paralyzed or tend to have seizures.

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