Muscle Lab Report

I’m Brian in 10 grade. I need help for my biology lab. Please see the attachment for more details/Instructions (READ THEM â?? THEY TEND TO BE IMPORTANT!) Read the background information.Complete the hands on activity.You will need to gather some simple items for your activities.Record your data and observations, and respond to the questions
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Graded Assignment
SCI203B: Biology | Unit 3 | Lesson 7: Muscle Fatigue Lab
Bio203B: Lab 4.07 Muscle Lab Report
Name:
IMPORTANT NOTE! In this lab you will be doing some physical activities. If there is any medical reason that this
may be tough for you or cause you harm in any way, please get a parent, sibling or friend to help you out. Your
responses will be graded on accuracy and quality, not on how well your muscles â??performed.â?? â?º
Instructions (READ THEM â?? THEY TEND TO BE IMPORTANT!)
1. Read the background information.
2. Complete the hands on activity. You will need to gather some simple items for your activities.
3. Record your data and observations, and respond to the questions. This lab is worth 16 points.
Part 1. Weight Lifting!
Items needed:
â?¢
â?¢
Timer (on a watch, clock, phone, etc.)
2 similar items that weigh several pounds (books, weights, or cans)
Activity
â?¢
Hold one book (or other item) in each hand.
â?¢
Raise one arm straight out parallel to the ground AND
â?¢
Let your other arm hang down along your side.
â?¢
Record the amount of time you can remain in this position (#1).
â?¢
Switch arms, repeat the test, and record that time (#1 Trial 2).
Background
Your muscles need glycogen (muscle sugar) in order to function. When the glycogen is broken down into
energy for the muscles, a waste product called lactic acid is produced. A buildup of lactic acid decreases the
musclesâ?? ability to contract and muscle fatigue sets in.
Results and Analysis
1. How long did you hold both books in this position before fatigue got the better of you?
â?¢ Trial on side 1:
â?¢ Trial on side 2:
2. Which muscles experienced the most fatigue (biceps, triceps, deltoids, or pectoralis major)? Refer to
an arm muscle diagram for help answering this question.
â?¢
3. Using all of the key words in bold type in the Background section above, explain why the arm raised
out to the side fatigued more quickly than the arm down by your side. Answer in a complete sentence.
â?¢
Part 2. Too Tired to Sitâ?¦
Graded Assignment
SCI203B: Biology | Unit 3 | Lesson 7: Muscle Fatigue Lab
Items needed:
â?¢
A blank wall that will support you!
Activity
â?¢
Wall-sit against the wall with your knees bent at a 90 degree angle.
â?¢
Hold this position for as long as it takes to feel muscle fatigue. (If itâ??s been
more than 3 minutes, youâ??re not doing it right!)
â?¢
Be sure to record your time (#5).
Background
Muscle fatigue refers to the decreasing ability of muscles to contract, generating force. Lactic acid is a
chemical compound that plays a role in various biochemical processes. During exercise when the rate of
demand for energy is high, glucose is broken down and lactate is produced faster than the tissue can remove
it, so lactic acid begins to accumulate in the muscles.
Source: â??Muscle Fatigue.â? Boundless Anatomy and Physiology. Boundless, 14 Nov. 2014.
â?¦lactate or, as it is often called, lactic acid buildup is not responsible for the muscle soreness felt in the days
following strenuous exercise. Rather, the production of lactate and other metabolites during extreme exertion
results in the burning sensation often felt in active muscles, though which exact metabolites are involved
remains unclear. This often painful sensation also gets us to stop overworking the body, thus forcing a
recovery period in which the body clears the lactate and other metabolites.
Source: Roth, Stephen M. “Why Does Lactic Acid Build Up in Muscles? And Why Does It Cause Soreness?”
Scientific American. N.p., 20 Jan. 2006. Web. 16 Apr. 2017.
Results and Analysis
4. How long did you hold the wall-sit before your legs started to burn like crazy?
â?¢
5. Which muscles could you feel it in more, the quadriceps or hamstrings? Refer to a muscle diagram for
help answering this question.
â?¢
6. Using all of the key words in bold type in the first part the Background section above, explain why it
gets more difficult for your muscles to contract like they had to in order to hold your body in a wall-sit.
Answer in a complete sentence.
â?¢
7. Using the second part of the Background section above, explain how lactic acid makes the muscles feel
during exertion. Answer in a complete sentence.
â?¢
Part 3. To Beat or Not to Beat?
Items needed:
â?¢
Something you can squeeze in one hand like a ball or toy
Activity
Graded Assignment
SCI203B: Biology | Unit 3 | Lesson 7: Muscle Fatigue Lab
â?¢
Extend your arm out in front of you and using your hand, squeeze a tennis ball very hard one time each
second for as long as you can keep squeezing. This is what your heart does to keep you alive!
â?¢
Record how long you could keep squeezing (#9).
Background
Your heart is made up of a very special type of muscle called cardiac muscle. It keeps working hard from
before the day you are born until the moment of your death. It never needs to stop and rest like your skeletal
muscles do. Cardiac muscle does not experience muscle fatigue but skeletal muscles do. In your activity you
compared cardiac and skeletal muscles with the help of your strong arm and a â??tennis ball heartâ?.
Results and Analysis
8. How long did you â??live?â? (How long could your hand keep squeezing like your heart does until your
hand and arm muscles fatigued?)
â?¢
9. Use the information in the Background section above to answer this question. Which muscles
experience muscle fatigue â?? cardiac muscle, skeletal muscle, or both?
â?¢
10. Why is it important that your cardiac muscle is different from your skeletal muscles? Answer in a
complete sentence.
â?¢
Part 4. Get a Grip!
Items needed:
â?¢ A popsicle stick, pen, pencil, or other long skinny item
â?¢ A paperclip, bobby pin, wire, or other bendable item
Activity
1. Hold the stick in front of you, parallel to the table top.
2. Place a bent paper clip on the stick.
3. Raise the stick until the legs of the paper clip just touch the table.
4. The top of the paper clip should rest on the stick.
5. Hold the stick as steady as you can for 1 minute and observe (#13).
6. Then grip the stick as tight as you can, hold it steady for 1 minute,
and observe what happens (#14).
Background
After just 7 seconds of use, a muscle begins producing lactic acid as glycogen is broken down to provide
energy. To help delay muscle fatigue, the muscle fibers are constantly switching on an off to allow individual
fibers a moment to rest. This activity demonstrates the effects of action of muscle fibers.
Results and Analysis
11. What happened to the paper clip even when you tried to keep your hand steady for the first minute?
â?¢
12. What happened when you gripped the stick as tight as you could for the second minute?
Graded Assignment
SCI203B: Biology | Unit 3 | Lesson 7: Muscle Fatigue Lab
â?¢
13. Use the information in the Background section above to explain (in a complete sentence) why the
muscles in your hand moved the way that they did.
â?¢
Part 5. Clothespin Calisthenics
Items needed:
â?¢
â?¢
A clothespin, hair clip, or other item that can be pinched open
Timer (on a watch, clock, phone, etc.)
Activity
1. Hold a clothespin between your thumb and index finger and squeeze it
open and closed as quickly as you can. See how many times you can
squeeze it in one minute. Record your data (#1).
2. Now, without resting, squeeze it as fast as you can for a second minute.
Record your data (#1).
3. Finally, complete 1 more minute, squeezing quickly, and record (#1).
Background
Muscle fatigue can also be observed by repeating the same activity and measuring the difference in ability as
time goes on.
Results and Analysis
14. How many times did you squeeze the clothespin the first minute, second minute, and third minute?
â?¢
First minute trial:
â?¢
Second minute trial:
â?¢
Third minute trial:
15. If you completed a fourth trial, do you think you would squeeze more times or fewer times than you
did on the third trial?
â?¢
16. Imagine that you had to repeatedly lift 50 pounds over your head for 1 minute, rest for 1 minute, and
then repeat lifting 50 pounds over your head for 1 minute for 3 more times. Would you expect to be
able to lift the weight more times or less times by the last trial? Using the key words from the
different Background sections in the lab report explain why you expect this outcome.
â?¢

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