SURFACE AREA TO VOLUME RATIO Flashcards
What is surface area?
;=refers
; to the outside AREA of an object
Surface area in biology?
(the area OUTSIDE of a cell)
What is volume?
[] amount of “water” it can hold. (inside of a shape)
Do amoeba have a large SA;V ratios?
(amoebas-50 and 750 micrometers)-millionth of a meter
Amoebas have a HUGE sa;v ratio
Would a ball have a large sa;v
yes,Balls have a small SA but are empty inside= small volume (they have ENOUGH SA FOR THEIR VOLUME)
do single celled organism need a transport system?
NO, can rely on diffusion for the transport of molecules through its surface
Would a human have a larger SA;V ratio than an amoeba?
No, because the 🡅 the organism the ⟱ SA;V ratio
Why can't humans rely on diffusion through their surface? //=however
{} cells on the surface can get enough o2
//not enough o2 can diffuse into cells in the centre of the organism(far way from {} surface)So, if larger organism cannot rely on diffusion through their surfaces, what do they have instead?
Special structures=w/ large surfaces
ALSO transport systems to carry gasses around {} body
IMAGINE A CUBE w/ side lengths of 1mm work out the SA;V ratio?
SA OF EACH SIDE: (1mm x 1mm) =1mm^2
TOTAL SA: 1mm^2 x 6 =6mm^2
VOLUME=1mm x 1mm x1mm =1 mm^3
SA;V RATIO= 6; 1
Where do fish get their 02 from?
from {} water
DESCRIBE THE PROCESS IN WHICH FISH OBTAIN 02?
{} 02 -rich water passes in {} 👄
then 🚿 over the 🐟= 🩸 stream
What are the gills covered in?
a number of fine filaments= where gases flow in/out of the blood
DESCRIBE HOW O2 GETS INTO THE BLOOD?
DOB passes into the FILAMENT
O2 diffuses from the water into the blood
OB returns to the 🧘🏻♂️
1 ADAPTATIONS OF THE FILAMENT
THE F=gives gills large SA;V
