The body can store some of the things it needs to function Some animals have the ability to store oxygen for long periods of time allowing them to hold their breath However humans can only store oxygen for a very short period of time Background Information Oxygen is essential to life We use the oxygen we breathe and the food we eat to produce energy which our cells can use Physical activity increases our need for energy increasing the use of oxygen and nutrients At rest the blood holds about a quart of dissolved oxygen but it is constantly being used by the cells to transform energy during cellular respiration The respiratory system must work all of the time to supply enough oxygen to the body Question What is the effect of exercise on breathing rate Hypothesis Make a prediction about the effects exercise on breathing rate EXPLAIN the reason for your prediction Procedure 1 Determine your resting breathing rate Sit down and breath normally Use a clock or stopwatch to time a 1 minute time period During this time count the number of times you inhale RECORD this information in the table in the data section 2 Repeat Step 1 bwo more times Record your trials Calculate an average resting breathing rate 3 Determine your breathing rate during exercise Run in place for 1 minute During this time count the number of times you inhale RECORD this information in the table in the data section 4 Repeat Step 3 two more times Record your trials Calculate an average breathing rate during exercise 5 For the last lest choose an activity that you can do for one minute sit ups jumping jacks jump rope standing on one foot dance the twist touching your toes etc While doing the activity count the number of times you inhale in one minute RECORD this information in the data section 6 Repeat Step 5 two more times Record your trials Calculate an average breathing rate C