Question

A student in an exercise and physiology class is collecting data on how a person's respiratory rate changes based on their activity level. The student measures several classmates' respiratory rates for three activity levels: while at rest, while walking, and while running. The average respiration rates were 13 breaths per minute, 27 breaths per minute, and 42 breaths per minute, respectively. Which statement best explains the observations?
a. As activity level increases, muscles require more oxygen to break down glucose to do work.
B. As activity level increases, muscles require more glucose to be delivered to them as their energy source.
C. As activity level increases, muscles require more carbon dioxide to break down glucose to do work.
D. As activity level increases, muscles require more hemoglobin to be delivered to them as their energy source.

Answer 1

Answer:

A.

Explanation:

As activity level increases muscles need more energy which come from breakdown of glucose with the help of oxygen. Heart beats fast to provide more and more oxygen at that time