A Level Biology - Exchange Surface and Breathing

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Last updated: February 8, 2018

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First submitted	February 8, 2018
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Average score	36.0%
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Defintion	Keyword
Surface area divided by volume	Surface area to volume ratio
Tiny folds of the lung epithelium to increase the surface area	Alveoli
Smaller airways leading into the lungs	Bronchi
A layer of muscle beneath the lungs	Diaphragm
Mucles between the ribs	Intercostal mucles
Main airway leading from the back of the mouth to the lungs	Trachea
Refreshing of the air in the lungs	Ventilation
A form of connective tissue	Cartilage
Layer of cells that have many hair-like extensions	Ciliated epithelium
Protein fibres that can deform and then recoil to their original size	Elastic fibres
Cells that secrete mucas	Goblet cells
Involuntary muscle that contracts without the need for conscious thought	Smooth muscle
The number of breaths per minute	Breathing rate

Defintion	Keyword
The volume of oxygen absorbed by the lungs in one minute	Oxygen uptake
The volume of air inhaled or exhaled in one breath, usually measured at rest	Tidal volume
Device that can measure the movement of air in and out of lungs	Spirometer
The greatest volume of air that can be expelled from the lungs after taking the deepest possible breath	Vital capacity
The mouth	Buccal cavity
Where two fluids flow in opposite directions	Countercurrent flow
Slender branches of tissue that make up the gill	Filaments
Folds of the filament to increase surface area	Lamallae
Bony flap that covers and protects the gills	Operculum
Extrernal opening or pore that allows air in or out of the trachea	Spiracle
Fluid found at the ends of the tracheoles	Tracheal fluid
System of air-filled tubes in insects	Tracheal system