2.4 Flashcards
(20 cards)
State three features to ensure an efficient gaseous exchange with the surroundings
1.Moist
2.Thin
3.Large
What is moist surface?
Moist surface of respiratory structures such as moist surface of alveoli
What is a thin respiratory ?
Thin respiratory structures such as the walls of alveolus and blood capillaries which are one cell thick
What is a large surface area?
Large surface area of respiratory structures such as the surface area of millions of alveoli
Amphibians can live on both
On land and in water
What can the respiratory structure of a frog do when on land
Increase the efficiency of gaseous exchange
Other than lungs ,what else do they use for gaseous exchange
Moist outer skin
State two factors about the frog moist outer skin
Thin and very.. I DUNNO I CANT READ.
Why is the frog skin always moist?
Always covered by a layer of mucus which causes the respiratory to dissolve and diffuse easily
What is under the layer of the frog skin?
Dense network of blood capillaries to increase diffusion rate
What can gills do underwater
Adapt to increase the efficiency of gaseous exchange in water
Gills are made up of two rows of fine (___) that have many (___) and (___) projection known as (____)
- Filament
2.thin
3.flat
4.lamellae
What do the number of filaments and lamellae
Large surface area to facilitate gaseous exchange
What is trachea system made up of
air tubes known as trachea !!
How does air enter / leave trachea ?
Through breathing pures known as spiracles
How are the opening / closing controlled ?
By valves , which allow air to leave and enter the body?
Trachea is divided into fine branches known as
Tracheoles
Why do tracheoles have a thin and moist wall?
to increase the efficiency of gaseous exchange
Some insects have what in trachea system ?
Air sacs
Air sacs are filled with ?
air to increase the rate of exchange of respiratory gases between tissues
