Carbon Dioxide and Water Readily Combine to Form Carbonic Acid

question 39

Essay

Carbon dioxide and water readily combine to form carbonic acid.The change in pH as the acid dissociates can be demonstrated with an indicator dye that changes color at a particular pH.In your physiology lab, you perform this experiment in two beakers containing room-temperature water and indicator, labeled Resting and Exercise based upon the status of the student who exhaled through a straw into the solution.The Resting student had been sitting at the table for 30 minutes before exhaling while the Exercise student had just finished sprinting up the stairs to class late.A stopwatch was used to measure how long it took for the solutions to change color.The following data were generated by the students.Explain why the time required for the color to change was different between groups, using the word substrate in your answer.
$$\begin{array} { | l | l | l | } \hline \text { Student } & \begin{array} { l } \text { Time for reaction (seconds): } \\\text { Resting }\end{array} & \begin{array} { l } \text { Time for reaction (seconds): } \\\text { Exercising }\end{array} \\\hline 1 & 123 & 20 \\\hline 2 & 114 & 23 \\\hline 3 & 136 & 17 \\\hline\end{array}$$

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Definitions:

Extracellular Matrix

A complex network of proteins and carbohydrates surrounding cells, providing structural support and influencing their functions.

Covering And Lining Layers

refer to the protective or enclosing tissues in the body that cover surfaces or line cavities, including skin, mucous membranes, and the lining of body cavities.

Connective Tissue

Body tissue that plays a role in supporting, linking, or segregating various tissues and organs.

Muscle Tissue

A tissue composed of fibers capable of contracting to produce movement in the body.