Question
a)Distinguish between the counter flow and parallel flow system in gaseous exchange
b)Which of the two systems mentioned in (a) above is efficient? Give a reason
b)Which of the two systems mentioned in (a) above is efficient? Give a reason
Answer
a) Counter flow is a flow system in which blood and water (a fluid) flow in opposite directions within respiratory surfaces maximizing the concentration gradient and resulting in efficient gas exchange along the entire exchange surface. Example: fish gills.
On the other hand, parallel flow is a system in which blood and water (fluid) flow in the same direction within respiratory surfaces allowing gas exchange to occur as long as a partial pressure difference exists. Example: human lungs.
b) Counter current flow - it increases efficiency in oxygenation of blood and maintains a steep concentration gradient
On the other hand, parallel flow is a system in which blood and water (fluid) flow in the same direction within respiratory surfaces allowing gas exchange to occur as long as a partial pressure difference exists. Example: human lungs.
b) Counter current flow - it increases efficiency in oxygenation of blood and maintains a steep concentration gradient
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