Neurophysiology Virtual Lab Blog

What was the point of the lab?

The point of this lab was to learn how nerves respond to stimulus. We were able to learn more about this by virtually dissecting the leech and learned more about this by looking at nerve cells located in the ganglia which is on the ventral side, close to the body wall. This was performed by checking neuron sensitivity to stimuli including a feather, forceps, and probe. 

How is this applicable to people?

We use leeches because their systems are easier to understand and it turns out that their simple nervous systems obey many of the same rules as complex ones like ours.Simple systems may be directly relevant in trying to understand our brains. Who knew these bloodsucking vampires could be so important to us. Yay for leeches! 

According to the data i gathered, Cell type R responded to no stimuli, feather, probe, and forceps. Cell type T responded to feather, probe, and forceps. Cell type N responded to only the forceps. Cell type P only responded to the probe.  Lastly, cell type X did not respond to anything. 


The picture below is the ‘dyed’ cell from the stimulation for cell type X. 



Anatomy & Physiology of the muscles

Anatomy- The sarcoplasm, myofibrils, sarcolemma, striated, and the nuclei are what make up muscle fibers in the microscopic level! The sarcoplasm is the cytoplasm of the muscle fiber which is mostly occupied by myofibrils! Myofibrils are cylinder like bundles of proteins, Living muscle fibers usually contain hundreds to thousands of myofibrils. The calcium in the sarcoplasm is important to muscle fibers because it helps with contractions that take place and regulation. The nuclei are usually located under the sarcolemma and are dispersed through out the fiber. Each nuclei is responsible for metabolic needs surrounding the sarcoplasm. The genes in the nucleus include enzymes and proteins essential for muscle fibers.

Physiology- All contraction occurs from effort originating in the brain. The brain is able to send action potentials through the nervous system that puts muscle fibers to work. The action potential reaches the axon of the motor neuron then the action potential activates gated calcium ion channels and the calcium rushes in. The action potential on the muscle fiber also causes the sarcoplasmic reticulum to release calcium ions. The calcium binds to the troponin on the filaments of the myofibrils which eventually leads to the troponin that sets the tropomyosin. After all of that the cross bridge comes into play which binds to the newly uncovered binding sites. Then ATP binds the cross bridge. During all of this, Calcium is constantly pumped into the sarcoplasmic reticulum and as long as calcium is present this will continue causing muscle contraction.


3 Question Blog (Jan. 10th)

1. What tasks have you completed recently?  

To be honest, I haven’t completed much. I did NOTHING all break, but it was nice because i got to relax and got to have two weeks without stress… well kind of. Oh i know what I have completed recently! I did a lot of chores for my mom! I tried getting on her good side this break so she could let me go out with friends and such! It worked so I will definitely continue to do that. Part of the key to mom’s happiness is to clean. 🙂 


2. What have you learned recently? 

Well since we are back in school, I’ve learned that my statistics class is not your average math class. The text books are so different compared to all the other math books I’ve had! They make jokes, they don’t use words you don’t understand. My kind of math book! I just hope the class continues to go the way it has! Maybe I’ll actually enjoy math this year and hopefully it isn’t stressful! Image


3. What are you planning on doing next?

I’m planning on focusing on school and try to actually do my homework. Starting with these blogs! I know I could’ve done so much better last semester in Anatomy, but i got lazy and that is obviously never good. I will also be preparing to finish my senior year! I’m going to be done with high school in approximately four months. It’s scary to think in a couple of months I will be a college student so might as well have fun for the next months, but not too much fun. I have to focus on homework… 😛