Description
Hello I am looking for help in completing my lab assignment please. If there are any problems please feel free to write me.
Unformatted Attachment Preview
Purchase answer to see full attachment

Explanation & Answer

Hello, your assignment is ready, kindly fill the data for experiment 8 and 9. Please, let me know in case you need any further clarification.
Lab 7 The Muscular System
BIO201L
Student Name: Click here to enter text.
Kit Code (located on the lid of your lab kit):Click here to enter text.
Pre-Lab Questions
”1. How do banding patterns change when a muscle contracts?”
The actin and myosin myofilaments reduces in length making them to come together when
there is mucle contraction. While the H and I shrinkes and becomes narrow, and the
contraction of muscle does not affect the A band.
”2. What is the difference between a muscle organ, a muscle fiber, myofibril and a
myofilament? ”
A muscle organ is the tissue consisting of cells and fibers that generate movement via the body
during contraction such as stomach. A muscle fiber is cylindrical and compose of many nucleus
with myofibrils that when they are stimulated they contracts for example, the leg muscles.
Myofibrils are contain in the muscles that are striated, and there cells are elongated and thread
like appearance, and it include actin and myosin also. Myofilament are the individual filaments
that consist on actin or myosin that forms the myofibril.
”3. Outline the molecular mechanism for skeletal muscle contraction. At what point is ATP used
and why? ”
ATP binds to the myosin. Myosin changes the ATP to ADP and Pi, which binds to myosin head.
Calcium then bind to the troponin causing a conformational change in the tropomyosin protein.
Tropomyosin then expose the myosin binding site on the actin filament which leads to
formation of cross bridges at the mysosin. This leads to the ADP and Pi to be released and
makes the myosin head to change its shape. Hence, the sliding of the actin towards the center
of the sarcomere generating the power stroke. ATP is used up to generate more glycogen,
glucose and fats can be used as the alternative source of energy for ATP. This energy leads to
increase temperature of the body and the rate of the heart in order to permit blood flow
rapidly and control the homeostasis.
”4. Explain why rigor mortis occurs. ”
It occurs when there is stiffening of the body for numerous hours after the death of a muscle.
This is due to partial contrsction of skeletal muscle , since this muscles are usually tensed and
they are unable to relax.
Experiment 1: Tendons and Ligaments
Post-Lab Questions
”1. Label the arrows in the slide images below based on your observations from the
experiment....
