EXERCISE NO. 2

Question 1

Title

Answer 1

Cellular Respiration

Question 2

is a chemical reaction that occurs in your cells to create energy; when you are exercising your muscle cells are creating ATP to contract

Answer 2

Cellular Respiration

Question 3

requires oxygen (which is breathed in) and creates carbon dioxide (which is breathes out)

Answer 3

Cellular Respiration

Question 4

cellular respiration formula

Answer 4

C6H12O6 + 6O2 -> 6CO2 + 6H2O + 36ATP (energy)

Question 5

Three different indicators of cellular respiration used in the experiment

Answer 5

breathing rate
heart rate
carbon dioxide production

Question 6

how is carbon dioxide production measured?

Answer 6

the time it takes bromothymol blue to change color

Question 7

CO2 production can be measured by breathing through a straw into a solution of ________

Answer 7

Bromothymol blue (BTB)

Question 8

is an acid indicator; when it reacts with acid it turns from blue to yellow

Answer 8

Bromothymol blue (BTB)

Question 9

When CO2 reacts with water, what weak acid is formed?

Answer 9

carbonic acid (HCO3)

Question 10

the more CO2 you breathe into the BTB solution, the ______ it will change color to yellow

Answer 10

faster

Question 11

formula of reaction of CO2 + water

Answer 11

6CO2 + 6H20 –> 6HCO3 + 6H+

Question 12

how many drops of BTB solution was added to 20 ml of tap water?

Answer 12

8 drops

Question 13

How did exercise affect the time needed for the solution to change color? Explain why the color change occurred (How does BTB work?)

Answer 13

the color change is faster after exercise since more CO2 is produce making the solution acidic faster comparted to no exercise

Question 14

What can you conclude about the effect of exercise on the amount of carbon dioxide that is present in your exhaled breath? Why is this so?

Answer 14

The exercise increases the production of carbon dioxide because physical activity raises the metabolic rate, causing the body to use more oxygen and produce more carbon dioxide as a metabolic byproduct, which is then exhaled during respiration.

Question 15

What can you conclude about the effect of exercise on breathing rate? Why is this so?

Answer 15

The exercise increased the breathing rate due to increased demand for oxygen by working muscles during exercise. To meet this demand, the body accelerates breathing to supply more oxygen and remove excess carbon dioxide produced during heightened metabolic activity.

Question 16

What can you conclude about the effect of exercise o heart rate? Why is this so? What do your muscles need during exercise that the blood brings?

Answer 16

The exercise increase heart rate. This is because exercise requires more oxygen and nutrients to be delivered to the working muscles, and the heart responds by pumping more blood to meet this demand. During exercise, muscles need oxygen, glucose, and other nutrients that the blood carries to produce energy (ATP) for muscle contractions. The increased heart rate ensures the efficient delivery of these essential resources to support muscle activity.