Bone Tissue Lap Report
LAB REPORT 1 ACTIVITY:
Students should read through activity to understand how it was conducted, the observations made before, during and after the experiment, and then answer the questions that follow.
Please, type each question followed by the answer to that question. The answers should be properly numbered, typed, and double-spaced with 12 font size. There should be a cover page. The cover page should have the student name, Professor’s name, assignment title and date. The assignment should be submitted online. Click on lab report submission to upload the lab report.
NOTE*: The amount of writing for each question should NOT be more than half a page.
OBJECTIVE: This activity will help students understand the main differences between connective tissues and other main classes of tissues. It will also help students correlate structure and function of the components in a prototype connective tissue used in this case, the bone.
BACKGROUND: The human body has 4 main types of tissues. Each type has specific characteristics that help determine their structure, and consequently their function and location. If the properties of any of the components of the tissue changes, the characteristics of the tissue will change, and so will it’s functions.
PART 1
What makes bones strong?
Although bones are relatively light, they are strong. Really strong for a variety of reasons: a characteristic that is very important to their functions in the human body.
The things you need for this experiment:
o Dried clean chicken leg bone (after cleaning the flesh from the chicken bone, you can let it dry up in the sun for about a day or two).
o A glass (should be big enough to contain the whole bone)
o White vinegar
Steps to follow:
1. Without breaking the bone, hold the bone and try to bend it – don’t force it to bend; else it will break! Take note of the stiffness of the bone.
Record your observation of the bone.
2. Place the chicken bone in a glass and fill it with white vinegar. Take note of the appearance of the bone in the vinegar at the start of the experiment, and also observe the appearance at the end of the experiment.
3. Let the bone soak for 2-3 days, then pour out the vinegar
4. Add fresh vinegar and let it soak for about 3 or 4 more days.
5. After the 6th or 7th day of soaking, observe the vinegar solution with the bone, then take out the bone and dry it off. Now try to bend the bone without breaking it as initially done in step 1. What do you notice? How does it feel different from before you soaked it in the vinegar?
PART 2
The table below represents the weight of the bone recorded every day with the electronic scale for 9 days. Assume this weight to be the weight
of your bone, and use it as your data.
Time/day
Bone weight/grams
1
26.10
2
26.10
3
22.00
4
18.20
5
14.00
6
10.00
7
6.00
8
4.00
9
4.00
QUESTIONS:
1. What is connective tissue and what are the characteristics that make it different from the other types of tissues? 15points
2. Why is bone considered a connective tissue? Identify the specific components in bone that make it a connective tissue. 10points
3. Describe the results of your observation in experiment of PART 1, before and at the end of your experiment. 15points
4. Give a detailed explanation of the reason for your observation in #3. 15points
5. Using a graph paper or excel, plot a graph using the data on the table in PART 2, with Time(days) on the X-axis and bone Weight(grams) on the Y-axis. 10points
6. Give a detailed explanation about the shape of your graph. 10points
7. Is there a relationship between the shape of the graph and your observations of the experiment in PART 1? Please, explain why, if you think
there is a relationship. If there is no relationship, explain why you think there isn’t one. 10points
8. a) How does this activity justify the importance of maintaining homeostasis? 6 points
b) Name one parameter or variable in the human body whose change can theoretically lead to the situation in the experiment. 3 points
c) Identify at least 3 systems, that need to work normally, to prevent the situation in the experiment from happening in the body. 6 points
