Examine the curve below which is a measurement of energy cost of flight in a 15

Question

Examine the curve below which is a measurement of energy cost of flight in a 15 gram bird.

1. What is the minimum cost of transport in this bird? (make sure you include appropriate units in your answer)

2. If this bird has fat reserves of 2 grams, how many miles can it fly using only it's fat reserves?

3. How many joules of heat (minimum) will it produce?

4. If the fat is triglycerides, then a reasonable chemical formula is C51H140O6. Using only this fat, what will be the Respiratory Exchange Ratio (RER) of the bird when it is flying?

5. How many L of CO2 will it produce during it's flight? (be careful about units)

Examine the curve below which is a measurement of energy cost of flight in a 15 gram bird. 1) What is the minimum cost of transport in this bird? (make sure you include appropriate units in your answer) 2) If this bird has fat reserves of 2 grams, how many miles can it fly using only its fat reserves? 3) How many joules of heat (minimum) will it produce? 4) If the fat is triglycerides, then a reasonable chemical formula is Cs1H14006. Using only this fat, what will be the Respiratory Exchange Ratio (RER) of the bird when it is flying? 5) How many L of CO2 will it produce during its flight? (hint- again, be careful about units!) 2.5 2.0 1.5 0.5 0.0 0 2 4 8 12 14 Flight Speed (m/s) Speed (m/s) VO2 (mLO2/g.h) 4.0000 6.0000 7.0000 8.0000 9.0000 10.0000 11.0000 12.0000 13.0000 2.3333 1.8667 1.6000 1.4667 1.4200 1.4667 1.6000 1.8667 2.3333

Explanation / Answer

1. From different papers, it is given that- 1000 ml of O2 releases approximately 4.82 to 5 kcal of energy. The minimum oxygen expenditure of this bird is at the speed of 9m/s - 1.42 mLO2/g.h

1000 ml gives 5kCal, hence 1.42 mL gives (5/1000)* 1.42 = 0.0071kCal

2. 1g of fat releases 9kCal of energy, hence 2 g releases 18kCal energy approximately.

5 kCal is released when 1000 ml of O2 is utilized

or, 18 kCal is released when (1000/5)*18= 3600 mL of O2

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