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Aerobic Respiration
Reactants
Products
Advantages
Disadvantag
es
Anaerobic Respiration
Background Info
Under normal conditions muscles utilize oxygen (aerobic
respiration) to make ATP from glucose. This process is very
efficient and produces ~ 38 ATP’s for each molecule of glucose.
Carbon dioxide and water are the products of this reaction.
* When muscles undergo rigorous exercise they require more
oxygen to make ATP than the blood can supply. At this point
the muscle is forced to produce ATP without oxygen
(anaerobic respiration). Anaerobic respiration produces only
2 ATP’s for each molecule of glucose. The product of this
reaction is lactic acid.
* The advantages of anaerobic respiration are that the muscle
cell can make ATP without oxygen and it can make ATP very
quickly. This a particular advantage when lifting heavy
objects. The big disadvantage to anaerobic respiration is that
it produces lactic acid which gives muscles a temporary
burning sensation. Muscle fatigue results when the demand
for ATP is greater than the rate at which ATP can be produced
in the muscle fibers. As a consequence, ATP levels are too
low for muscle fibers to produce their maximum force
contraction. Under condition of extreme fatigue, muscles
become incapable of contracting or relaxing.
* Today you will experience the use of aerobic respiration and
anaerobic respiration by the muscle fibers in your fingers.
You will experience the production of lactic acid and the
sensation it produces in you muscles. This lab will
demonstrate how your body uses the resources available to
provide you with the energy you need to do work.
* If ________________________________ then
_______________________________.
*
Materials: 1 clothespin, 1 timer, 1 pencil, 1 data table, 1 sheet of graph
paper
Procedure:
1.
Hold the clothespin straight out and in between the thumb and
forefinger of your non-writing hand. The rest of your fingers should
be closed like a fist.
2.
We will be doing five (30 second) trials with a 15 second break
between trials.
3.
When the teacher says “Go”, start squeezing the clothespin as
many times as possible within the thirty second interval. Make sure
you have opened and closed completely on each squeeze.
4.
Keep a count of the number of times you have closed the
clothespin and write the number down in the data table.
5.
Graph the data that was just collected as a line graph. Label the xaxis with the trial number, and the y-axis with the number of
squeezes.
*
Trial
1
2
3
4
5
# of Squeezes
*
* Graphing your data! (TAILS-G)
* Line Graph
*
Write using complete sentences
* What does the graph and data show? Explain
your data.
* Does this support or not support your
hypothesis?
* What were your sources of error (reasons why
the numbers may not be accurate)?
* How could this experiment be improved or
expanded?
* What does the data mean? BE SPECIFIC! USE
DATA!
* How does it relate to the
purpose/hypothesis/question of the lab?
* What are Sources of Error?
*
*
* Write a discussion of this experiment in complete sentences.
Be sure to include the answers to the following questions.
* The “Data shows that….”
* Explain the relation ship between the IV and the DV (the
number of squeezes and the different trials).
* How does this relate to what was learned in anaerobic and
aerobic respiration?
* Future study: what is something else concerning muscle
fatigue that you would be interested in finding out the
answer to?