Lab 5: Cellular Respiration

Question 1

In the cellular respiration respirometer lab, metabolic rate was determined by measuring…

Answer 1

the volume of CO2 consumed overtime.

Question 2

Why was the respirometer submerged into water in the experiment?

Answer 2

To create a closed system where any changes in gas volume could be measured.

Question 3

Why did water move INTO the repirometer in the experiment?

Answer 3

To maintain constant pressure inside the respirometer, water moves into the respirometer to replace the volume lost due to the consumption of oxygen.

Question 4

What is the role of KOH in the respirometer lab experiment?

Answer 4

KOH is used to absorb any CO2 produced by cellular respiration.

Question 5

What is the formula for calculating rate of oxygen consumption in the respirometer lab experiment?

Answer 5

Question 6

What is the formula for calculating metabolic rate in the respirometer lab experiment?

Answer 6

Question 7

What is the relationship between the body size and metabolic rate?

Answer 7

Larger crickets have less surface area through which they can exchange gases, leading to a higher metabolic rate to meet the increased demand for oxygen.

Question 8

What is the relationship of metabolism with surrounding temperature in ectothermic and homeothermic animals?

Answer 8

The relationship between metabolism and surrounding temperature is due to their distinct thermoregulatory strategies.

• Ectotherms rely on external heat sources and exhibit more significant fluctuations in metabolic rate with changing temps
• Homeotherms maintain a more stable metabolic rate through internal heat production and thermoregulatory mechanisms.