Watch here: https://youtu.be/TbrA_-bEMns
Composed of actin and myosin
BANDS acTHIN -thIn (I BAND) myHosin be thick (H zone) actin AND myosin (A band)
To remember the zones that shorten remember to always WAVE and say HI (H zone and I band, A is unchanged) then you say Z you later at the end of each sarcomere
Correct me if anything is incorrect please ππ»π€π»
Since two Sarcomeres located next to eachother share a Z-line that separates them, their respective Actin filament can't both glide and pull the Z-line towards their respective M-band? Wouldnt that just be a tug of war?
What provides the physical force that causes the sarcomere to lengthen when the muscle relaxes?
I know about the myosin heads unbinding from the actin, but what's pulling the sarcomere back to its regular length? Is it the Z-disc?
I am trying to understand the answer to the following question: (T/F): The shorter the sarcomere length, the stronger the contraction.
In my research I'm coming across what seems to be contradictory info on this. Khan Academy has a video explaining that as the length of the sarcomere increases, the tension it can produce increases (up to a certain point, before dropping off).
If this is true, then why does the sarcomere shorten in order to provide the force generated during a muscle contraction? Wouldn't it imply that your muscles are capable of providing greater force in their relaxed, longer state?
I must be missing something, please help.
I've looked everywhere, but I cannot seem to get a consensus on lengths of H band and I band during contraction and relaxation. Can someone help me with this?
What about the overlap between myosin and actin? Does that change with contraction and relaxation?
With higher preload, will this be considered relaxation or contraction for the muscle?
Thank you so much!
Assume that two individuals who possess an identical diet, sleep pattern, nutritional regiment, who have spent equal times training, and who train all parts of the body at the same frequency, same volume, and same intensity are all x weight at 5% bodyfat at some part in the year. Then assume that next year at the exact same point in the year, they both weigh x+2 lbs of pure, lean muscle at 5% bodyfat. (No change in bodyfat)
What determines what sarcomeres are molded where? Why/how will one individual's body for example use the two pounds of muscle that was created by generating it in the areas of say the shoulder and chest while the second individual might have that muscle tissue generated in the quadriceps?
Assuming you train all bodyparts with equal intensity, what determines what parts of the body you're "gifted" in? For example, having naturally easy to grow/large shoulders while another person might have naturally easy to grow hamstrings or lats?
I'm trying to find a visual or book or something explains how Sarcomeres interact with their neighbors.
So I get that the Z-disk is pulled towards the M-Line (center), but yet neighboring Sarcomeres share Z-disks, so how would a shared Z-disk be pulled towards the center of two M-lines? Do certain Sarcomeres get a bigger calcium influx to allow for stronger contraction to outcompete its neighbor?
I just can't seem to find a decent explanation or animation that goes beyond a single Sarcomere, although I'm sure I could eventually find it. Maybe I'm just not using the right keywords.
I know the title is misspelled.
How strong is that thing? I wanna use it for my exoskeleton. How much force it can produce?
Is there some mechanism by which all of the z discs and m lines and h zones line up in muscles? And is there a reason that they do?
Between what two regions would contraction occur within a sarcomere? Would it be from Z-disk to Z-disk, because that's where the actin's are anchored? So it would like compress inwards?
Thanks!
