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the A band stays the same length because it is the length of the myosin filaments, and all the myosin does it sit there while actin slides past it.

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Which region of the sarcomere shortens during contraction the dark band the light band or both?

During contraction, the H zone and I band shorten while the A band remains the same length. The A band is the dark band in the sarcomere that contains the thick filaments, the I band is the light band composed of thin filaments, and the H zone is the area in the center of the sarcomere where only thick filaments are present.


According to the sliding filament theory What are four things sarcomere during contraction?

According to the sliding filament theory, during muscle contraction, the sarcomere shortens as the actin filaments slide over the myosin filaments. The I band decreases in length, while the A band remains the same. The H zone, which is the region of the A band where there is no overlap between actin and myosin, also shortens. Overall, this process increases the overlap between the actin and myosin filaments, leading to contraction.


What is the A band of a sarcomere?

The A band is a region in a sarcomere that contains thick myosin filaments. It remains the same length during muscle contraction as it corresponds to the length of the myosin filaments. The A band also contains some overlapping thin actin filaments.


When the sarcomere contracts which band becomes smaller?

When the sarcomere contracts, the I band becomes smaller. The I band is the region that contains only thin filaments (actin), and during contraction, the thin filaments slide past the thick filaments (myosin), causing this band to shorten. The A band, which contains both thick and thin filaments, remains the same length during contraction.


What happens to the length of the bands I A and H when sarcomeres shortens?

When sarcomeres shorten during muscle contraction, the I band and H zone both decrease in length. The I band, which contains only thin filaments, shortens as the thick filaments slide past them. The H zone, which is the area of the A band that contains only thick filaments, also diminishes as the thick filaments overlap more with the thin filaments. Overall, the A band remains the same length, while the I band and H zone decrease.


Is Sarcomere and sarcolemma the same thing?

sarcomere and sarcolemma are two different things. a sarcomere is between two d zisks of a myofiber (muscle fiber). a sarcolemma is a plasma membrane. there are many sections of sarcomere under the layer of sarcolemma.


Which can shorten during a muscle contraction?

None actually shorten. The thin and thick filaments that compose sarcomeres do not shorten; instead, they slide past one another, causing the sarcomere to shorten while the filaments remain the same length.


What would you have to do to make the elestic band the same length in air as it is in the water?

you put much more water


What are the differences between isometric, concentric, and eccentric muscle contractions?

Isometric muscle contractions happen when the muscle stays the same length, concentric contractions occur when the muscle shortens, and eccentric contractions occur when the muscle lengthens.


Describe which bands and zones of a sarcomere stay the same and which narrow or disappear during muscle contraction?

M line


When thick and thin filaments slide past each other does the fiber lengthen?

Muscles contract when sarcomeres shorten. The thin and thick filaments that compose sarcomeres do not shorten; instead, they slide past one another, causing the sarcomere to shorten while the filaments remain the same length.


Is base band and narrow band are same?

They are the same.