Recent questions without an upvoted answer

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What are the effects of tar on lungs?

asked Sep 4, 2017 in Biology by shamroz (41.5k points)

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What are the main effects of smoking?

asked Sep 4, 2017 in Biology by shamroz (41.5k points)

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What do you observe about the position of the heart in normal and smoker's chest cavity?

asked Sep 4, 2017 in Biology by shamroz (41.5k points)

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Compare non-smokers' lungs with those of smokers and note your observations.

asked Sep 4, 2017 in Biology by shamroz (41.5k points)

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Observe the presence of tar by rubbing white tissue paper on the inner surface of the funnel.

asked Sep 4, 2017 in Biology by shamroz (41.5k points)

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1 answer 354 views

Demonstration of the presence of tar in cigarette smoke and also showing

asked Sep 4, 2017 in Biology by shamroz (41.5k points)

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An animal is placed in an apparatus where it re-breathes the same air continuously. Its breathing rate increases. Why?

asked Sep 4, 2017 in Biology by shamroz (41.5k points)

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The amount of carbon dioxide is higher in exhaled air as compared to atmospheric air. Why?

asked Sep 3, 2017 in Biology by shamroz (41.5k points)

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Which of the flask is acting as a control? Justify.

asked Sep 3, 2017 in Biology by shamroz (41.5k points)

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1 answer 245 views

Which compound is formed when limewater combines with carbon dioxide?

asked Sep 3, 2017 in Biology by shamroz (41.5k points)

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1 answer 104 views

The result you have noted is only because of the carbon dioxide

asked Sep 3, 2017 in Biology by shamroz (41.5k points)

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1 answer 430 views

Demonstration of the presence of carbon dioxide in the exhaled air.

asked Sep 3, 2017 in Biology by shamroz (41.5k points)

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1 answer 162 views

In the lungs, the oxygen passes from the alveoli to the blood. What features make this process rapid?