I am doing a Muscle Physiology Lab and I have to graph the rectus femoris muscle
ID: 60398 • Letter: I
Question
I am doing a Muscle Physiology Lab and I have to graph the rectus femoris muscle. I also have to label the latent period, the contraction phase and the relaxation phase. I have a chart that lists the muscle twitch of the rectus femoris. It says the time and the tension. How do I determine the latent period, the contraction period and the relaxation period using the chart. I also need help doing the graph and how do I label it? please dont copy and paste information from the internet. I need a detailed explanation on how to complete the graph and label the three parts of the muscle twitch.
I also have to complete a table that includes three trials and I have to record the length, tension and type of contraction during an activity. I know how to measure the bicep during the activity which belongs in the length box and i know how to determine what type of contraction it is (isotonic or isometric) what i dont know is how to find the tension. what do I need to orecord in the boxes for tension in each of the trials. The activity rewuires us to lift a heavy text book while our arms are layed flat and feel the tension and measure the bicep and record the tension.
Explanation / Answer
**It would have been better if you provided the chart.
Actually the time and tension graph of muscle twitch is a bell -shaped graph. Time is taken on the X-axis and tension is taken on the Y-axis. Latent period is the initial first 2-3 seconds when stimulus is recieved. In this time, the muscle prepares itself for contraction. Just look at the graph. It starts somewhere on the X-axis after 0. That time period passed by is a few milliseconds. That is the latent phase.
Contraction phase is the next phase, in which the bell shaped graph ascends. It is the time when cross-bridge is formed between actin and myosin heads. In this phase, the muscle tension in
Relaxation phase is the last phast, in which the bell shaped graph descends. In this the muscle tension finally goes to zero. It is the time when Ca++ moves back into the SER.
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