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n200080 [17]
3 years ago
14

Explain how chemicals present in cigarette smoke are able to enter the body and reach the brain

Biology
1 answer:
kobusy [5.1K]3 years ago
4 0

When you smoke a cigarette, the components; e.g. nicotine and carbon monoxide enter the lungs and are absorbed into the bloodstream. They are carried by the Red Blood Cells to the blood-brain barrier, here, nicotine binds to nicotinic acetylcholine receptors (nAChRs), resulting to a cascade that results to release of dopamine (good-feeling neurotransmitter).






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Determine if the limiting factors listed below are density-dependent or density-independent.
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Answer:

Determine if the limiting factors listed below are density-dependent or density-independent?

food is density-dependent

Number of mates is also density-dependent

Habitat is density-dependent

a hurricane is density-independent

Hunting by humans is density-independent

Industrial pollution is density-dependent

Explanation:

The above limiting factors shows some density-dependent while one is density-independent. Food, habitat, and industrial pollution all depends on population as the lesser the population the smaller the limiting factors caused while hurricane and hunting by humans are density-independent.

Food, Habitat, Number of mates, and industrial pollution are all limiting factors that solely depends on density as the increase in density affects it greatly while hurricane and hunting by humans has nothing to do with increase or decrease in density, hence, they are density-independent

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Orca whales hunt in cold waters and travel to find food. Which of the following would be the most likely adaptation of an orca p
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Oxygenated blood returns to the heart from the lungs via four pulmonary ____.
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Answer:

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Answer:

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