exam qs lqc 7a Flashcards
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
brings oxygen to exchange system, maintains concentration gradient
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.
gas exchange occurs through the cell membrane, membrane is thin, oxygen enters cell from water, carbon dioxide leaves cell into water
Explain why cystic fibrosis affects the rate of oxygen uptake in the lungs.
thick mucus, accumulation of mucus which can’t be moved by cilia, restricting air flow through bronchioles, increases diffuse distance in the alveoli