The objective in this lab project is to be able to identify and describe the structure and function of tendons, ligaments, and cartilage. We also need to be able to identify muscles and their functions. And finally there is bone and what if consists of. This will also give us a little more experience dissecting fresh material.
The material used for this lab:
Tray with foil covering
I covered a tray with tinfoil, so that I could just pick up the foil to throw away contents later. Then I laid out all the other instruments I would need. I washed the chicken leg with soap and dried with a paper towel. I examined the outside of the leg first – then carefully cut the skin off, noting the connective tissue underneath. I observed the fat tissue on the outside of the skin. There were bundles of pink muscle underneath the skin. I then probed and found a tendon (shiny, white tissue). Next, I removed a single muscle, cutting away the tendons and prying it from the
|all skin is off|
|connective tissue just below the skin|
There were several muscles present in the leg. You could see some distinction as well as tendons that were holding them together. Where I noticed this the most was under the joint. You could definitely see some distinction between these muscles and the connective tissue holding them together.
Skeletal muscles are striated muscles that are arranged in bundles called fascicles. Theses fascicles are enclosed in a sheath called a fascia. And each fascicle contains anywhere from a few dozen to thousands of muscle fibers, or cells. Muscles cells have more than one nucleus and they are located just underneath the cell membrane because most of the interior of the cell is packed with myofibrils (long, cylindrical structures arranged parallel). And the myofibrils contain proteins called actin and myosin. (It is the interaction of these two proteins that allow muscle contraction). Besides being able to contract, allowing us to move, muscles resist movement, and they also generate heat.
|showing the hinge movement of the synovial joint|
|inside the bone|
Erythroblasts - this translates to RBC’s
Myeloblasts – this translates to Neutrophils, Eosinophils, and Basophils (granular leukocytes)
Monoblasts – translates to monocytes (agranular leukocyte)
Lymphoblasts - translates to lymphocytes (agranular leukocyte)
Megakaryoblasts – translates to platelets
In summary, I have demonstrated some of the components of the muscular system. And explained some of their function. It was interesting to see the texture and feel of a tendon. Maybe this explains why you can have tendonitis and it can feel like you have broken a bone, but you haven’t. You have an inflamed tendon instead. This lab helped to give me a better understanding of how it all works. Especially the stem cells and what they produce.
Human Biology: Concepts and Current Issues, 6th edition, Johnson
www.books.google.com (Biology: The Unity and Diversity of Life, 12th edition, Starr, Taggart, Evers, Starr