exam qs lqc 7a Flashcards

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1
Q

Describe how the following features assists in producing an efficient gaseous exchange system.
a) The lungs are composed of many alveoli. The alveoli are ventilated

A

brings oxygen to exchange system, maintains concentration gradient

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2
Q

An amoeba is a single-celled organism that lives in water. Gas exchange in an amoeba occurs between the water and the cytoplasm. suggest how gas exchange occurs in an amoeba.

A

gas exchange occurs through the cell membrane, membrane is thin, oxygen enters cell from water, carbon dioxide leaves cell into water

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3
Q

Explain why cystic fibrosis affects the rate of oxygen uptake in the lungs.

A

thick mucus, accumulation of mucus which can’t be moved by cilia, restricting air flow through bronchioles, increases diffuse distance in the alveoli

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