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Features of single celled organisms
.They are small large surface area to volume ratio
.therefore they have a small diffusion distance
.decreasing the distance over which the nutrients oxygen etc have to diffuse through is smaller
.higher rate of diffusion
.OVERALL low metabolic demand
What does the fact that single celled organism have a low metabolic demand and a large SA:V mean ?
Can rely directly to gas exchange
Because diffusion of oxygen and removal of co2 out of the cell happen at a rate that is sufficient to meet the metabolic demand of the cell.
Features of multicellular
Large →small SA:V
Large diffusion distance over which 02 has to enter and C02 has to be removed
High metabolic demand
Why do multicellular organisms have high metabolic demand
They are more active
They regulate they win temperature
Demand for entry of 02 and removal of C02 is very high
Why is a specialised exchange system required to meet metabolic rate of multicellular organisms
Simple diffusion cannot meet metabolic rate
Specialised exchange surface is required
To provide fast delivery of oxygen and glucose and fast removal of oxygen taste products such as Co2
