TBR BIO section 1, passage 7, question 45

[balambfishie]

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Cardiovascular stress is one common result of ingesting nicotine by smoking cigarettes. This supports the idea that:

A) nicotine stimulation of the nicotinic acetylcholine receptor is dominant in the sympathetic nervous system
B) nicotine stimulation of the nicotinic acetylcholine receptor is weaker in the sympathetic nervous system
C) nicotine acts directly on cardiac muscle to promote overstimulation and stress
D) nicotine acts indirectly through the central nervous system to produce cardiac stress


I understand the explanation insofar as eliminating C and D, but how can you tell if nicotine stimulation is stronger in the sympathetic NS vs. parasympathic NS just by knowing it creates stress on the heart? Is there something I'm missing?

 

[LoLCareerGoals]

Perhaps posting a passage might help for people who don't have your specific book?

 

[balambfishie]

Sorry, here's the passage. It's about nicotine replacement therapy.

 

[Singhp03]

Cardiovascular stress is one common result of ingesting nicotine by smoking cigarettes. This supports the idea that:

A) nicotine stimulation of the nicotinic acetylcholine receptor is dominant in the sympathetic nervous system
B) nicotine stimulation of the nicotinic acetylcholine receptor is weaker in the sympathetic nervous system
C) nicotine acts directly on cardiac muscle to promote overstimulation and stress
D) nicotine acts indirectly through the central nervous system to produce cardiac stress


I understand the explanation insofar as eliminating C and D, but how can you tell if nicotine stimulation is stronger in the sympathetic NS vs. parasympathic NS just by knowing it creates stress on the heart? Is there something I'm missing?

Answer A and b both list sympathetic NS, was this in the question or a typing error? Anyhow, stress on heart would have to do with sympathetic pathway bc parasympathetic slows down heart rate, thus causing a relaxing effect on cardiac tissue

 

[balambfishie]

Those were both in the question. Anyhow, thanks for the explanation. I can't believe I forgot to account for that when answering the question!

 

[Singhp03]

so was the answer B? edit😳pps sorry meant A

 

[member232]

Wouldn't the answer be A? If you're ingesting nicotine, you're overstimulating the nicotinic receptors, increasing sympathetic activity, which in turn would cause cardiac stress?

 

[cloak25]

Wouldn't the answer be A? If you're ingesting nicotine, you're overstimulating the nicotinic receptors, increasing sympathetic activity, which in turn would cause cardiac stress?

agreed👍

 

[Singhp03]

Wouldn't the answer be A? If you're ingesting nicotine, you're overstimulating the nicotinic receptors, increasing sympathetic activity, which in turn would cause cardiac stress?

absolutely right

 

[sciencebooks]

Wouldn't the answer be A? If you're ingesting nicotine, you're overstimulating the nicotinic receptors, increasing sympathetic activity, which in turn would cause cardiac stress?

👍 Used the same rationale without seeing the passage. I didn't know about C and D without the passage though.