• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Study of the strength of a muscle during different types of work

Extracts from this document...


Topic 11.2 study of the strength of a muscle during different types of work Introduction: The muscular-skeletal system and the nervous system are responsible for movement in humans. Muscles provide the force needed for muscle contraction. They do this when they contract. In the following experiment we were supposed to investigate the response of muscle during two exercises. Materials: Dynamometer and timer Methods: The whole investigation was divided into two parts. In both experiments the group was divided into three, a subject and a two test leader. In experiment 1 the subject was asked to press the dynamometer maximally after every ten seconds (intermittent work) during a time period of one minute while the test leaders noted the value and set the pointer of the dynamometer to zero each time. The experiment was then repeated for the other two members switching roles. In experiment 2 after giving some rest to the muscle the subject was asked to press the dynamometer again but this time continuously for one minute (continuous work). The test leader reads and notes the value of the mobile pointer of the dynamometer. Experiment 2 was also repeated switching the roles. The values obtained at the end of the exercise were then compared. ...read more.


Continuous work. Member 1 (best value) the calculation shows the uncertainty of member 1 during continuous work. 43.5�0.5�100) = 43.5 �1% Member 2(best value) the calculation shows the uncertainty of member 2 during continuous work 42.0�0.5 ( �100) = 42.0 � 1 % Member 3(best value) the calculation shows the uncertainty of member 3 during continuous work 24�0.5 ( = 24.0 � 2% Graph for table 1 Graph for table 2 Comarison of the two strongest group members with Japanese stud Average of the strongest grip of the three group members) Average of the strongest grip using the dynamometer between the age of 17 and 20 years given by the manufacturer. Conclusion& evaluation by looking at the graph for table one we can see that it is downward slopping for all three group members. The graph is downward slopping because the mass of muscle strength measured by the dynamometer decreases after every ten seconds. This was expected, as mentioned in the introduction muscles provide the force needed for muscle contraction. The more we contract the muscle the sooner will it get tired so because we were measuring the strength of the muscle after every ten second over a time span of one minute we expected the strength of the muscle i.e. ...read more.


It can only be used to compare our values with theirs. This can be seen in the results above the average (48) of the best value is higher than their best value average (43.5) There were a few weaknesses and limitations in the experiment that could have affected like the physical state of three members is not mentioned in the results table. Some members might be working out in gym etc which would make it easier for them to do these exercises especially the continuous one. Error from the dynamometer is not likely to affect our reading as the smallest unit on it was 0.5 which is big enough to site and took that as uncertainty to make sure that there is no error in our reading. Human reaction time can be another factor in such experiment as we use the stop watch this is the reason why we took an uncertainty of 1 sec in the table. 1 sec was the smallest unit visible in our stop watch. The readings for the experiment could have been improved if we had a third trial for both experiments, as the more trials we have the less would be possibility of an error. There is nothing much that could be done about human reaction error apart from taking an uncertainty like we did for this experiment. ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Biology essays

  1. Lion King-The Ecological study

    Carnivores meaning 'meat eater' is an animal that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of vertebrate and/or invertebrate animal tissue, whether through predation or scavenging. m) Consumer or a heterotrophy is an organism that uses organic carbon for growth by eating other

  2. Reaction Time

    The decision was depending on the availability of local sports clubs. I was at the time participating in boxing and lifting weights in the local gym so I decided to chose the boxing club and stationary bicycle that people carried out in the local gyms.

  1. Genetics NOTES

    the process of genetic engineering - A transgenic animal is an animal that has had a new gene implanted on it - Plasmids are found in bacteria and are cut open using an enzyme, having the foreign DNA inserted and the plasmid is rejoined - A recombinant DNA is a

  2. Allelopathy. Open Investigation Will increasing the number of allelopathic sunflower plants effect the ...

    This table shows the height data of all five repeated tests for each independent variable of the experiment. The number of days since the experiment started and date of which the height of the bean plants was recorded are also included in this table.

  1. IB Genetic Unit Notes

    Some genes have more than two alleles (multiple alleles). Most genes, in fact, have more than two alleles for example ABO blood groups. 4.3.4: Describe ABO blood groups as an example of codominance and multiple alleles. With multiple alleles, one chooses a single capital letter to represent the locus at

  2. Extended Essay: An Investigation Into the Differences In Life Expectancy For Males and Females ...

    be unrealistic, as this method would require me to lay out tape measures around the gravestones, and possibly walk over gravestones in order to reach the desired coordinate. This is disrespectful, not only to the memories of the deceased, but also to the people visiting the graveyard to remember the lives of those who died.

  1. Should Animals have the same rights as Humans? Both animals and humans exhibit behaviours ...

    He conditioned the circle to signal the delivery of food (create salivation) and the square to signal the delivery of no food (inhibit salivation). The table below shows that the circle always resulted in more drops of saliva being produced.

  2. Stimuli and Response. Investigation Question: How do different tempos of music affect response ...

    Repeat the procedure for each student. Data Collection and Processing: Raw Data Tempo of each Song Song Tempo (Beats per Minute) No Music 0 Serenade for Strings in C Major 66 � 1 Piano Sonata No. 8 in C Minor (Movement 2) 76 � 1 Violin Concerto No.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work