A group of science students have been learning how the human circulatory system reacts during exercise. The students measured their heart rates both before and after they ran five laps around the school gym. This was repeated two more times, with a 5 minute rest period between each trial. The average heart rates of the students are shown in the bar graph. Which of the following correctly states the general relationship between exercise and heart rate in humans

Which of the following correctly states the general relationship between exercise and heart rate in humans

A. Exercise lowers a person's heart rate

B. Exercise will increase a person's heart rate

C. The heart rate was highest in trial 2

D. There is no relationship between the average heart rate and exercise

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

i believe your answer would be c.. : )

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.