IB Biology B3.1 Definitions
This page contains our IB Biology definitions for B3.1. By learning each one of these definitions, you will fully cover the content for IB Biology 'Gas exchanges'.
alveolus
The smallest component in the lungs where gas exchange occurs
antagonistic muscles
A pair of muscles that exert forces in opposite directions to one another
emphysema
A chronic and progressive disease characterized by a breakdown of alveolar walls leading to larger air sacs with thicker and less permeable walls
epidemiology
The study of incidence and causes of disease
gas exchange
The process of oxygen and carbon dioxide diffusing across the walls of the alveoli
gas exchange
The process by which leaves expel oxygen and obtain carbon dioxide
halophyte
A plant that has adapted itself to a saline environment to conserve water
tidal volume
The volume of air inhaled or exhaled
transpiration
The loss of water as an inevitable consequence of gas exchange
transpiration stream
The flow of water caused by evaporation at the leaf putting tension on the column of water
ventilation
The consistent removal and replacement of air in the lungs via inhalation and exhalation of air
ventilation rate
The number of inhalations or exhalations per minute
xerophyte
A plant that has adapted itself to a desert environment to conserve water
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