Lec10- motor systems

Lecture 10 considered motor systems which is very broad topic. Even though the concept of muscle contraction and voluntary movement feels simple and is taken for granted by most of us is surprised me how complicated things truly are. I have always been interested in body movements and muscle related biology so this was very interesting week in that sense.

The whole concept of sarcomere and myosin and actin sliding over each other was totally new in conceptual level even though it is common knowledge that muscles contract and fibers slide across each other. It was also interesting how the contraction force is altered with firing frequency. It was left quite unclear what part of the bodies actually contain fast and fast fatigue-resistant cells since legs can be under a lot of stress for a long time and thus those can’t be fast cells but you certainly can train your legs to be very tired after few squats or runs really quickly in seconds.

Proprioception was also very interesting topic since I haven’t really thought it that much that one knows all the time how contracted one muscle is. It has been stated that brain leaves some power in bank even though one tries to fully use its muscles but the brain stops when fatigued enough. It has been rumoured that there would still be 40% left in tank even when feeling tired. One might start to think that would this boundary exist if this proprioception would be inactive and there would be no limits of muscle contraction and no info how contracted a muscle is. Would the muscle pull itself from the joints?


Responses
Write your thoughts...Your email will not be published

Comment

Name

Website