Question

directions: select each correct answer. more than one answer may be correct.
shelby performed an investigation in which she monitored her heart rate while she ran on a treadmill. she used a heart rate monitor before she started running and determined that her resting heart rate was 62 beats per minute. after 10 minutes of running, the heart rate monitor showed that shelbys heart rate was 141 beats per minute.
what was shelbys blood delivering to her cells at an increased rate as her heart rate increased?
atp carbon dioxide oxygen lactic acid

Explanation:

When the heart rate increases during exercise (like running), the body's cells need more energy. Cellular respiration requires oxygen. The blood, pumped faster by the heart, delivers oxygen to cells at an increased rate. ATP is produced within cells using oxygen (through cellular respiration), not delivered by blood. Carbon dioxide is a waste product (removed, not delivered more). Lactic acid builds up in cells (especially in anaerobic conditions) but is not something the blood is delivering at an increased rate as a beneficial substance during normal increased - heart - rate (aerobic) exercise.

Answer:

oxygen