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What is the change in appperence of a myofibril during contraction with the I band?
In skeletal muscle contraction, the thin filaments of the sarcomere slide toward the M line, in between the thick filaments. This is called the sliding filament theory. The width of the A zone stays the same, but the Z lines move closer together. As the sarcomeres shorten and appear closer together, the muscle pulls together, producing tension that moves whatever it is attached to.
What else can I help you with?
What is a myofibril made up of?
A myofibril is made up of repeating units called sarcomeres. Sarcomeres contain thick and thin filaments that slide past each other during muscle contraction. The protein fibers actin and myosin make up the thin and thick filaments, respectively.
What are tiny contractile units linked together on a myofibril?
Sarcomeres are the tiny contractile units linked together on a myofibril. They are the functional units of muscle tissue and are responsible for muscle contractions. Sarcomeres consist of thick and thin filaments made of proteins that slide past each other during muscle contraction.
What happens If a muscle is applied to a load that exceeds the muscle's maximum tension?
The muscle length will not change during a contraction.
What muscle contraction occurs in the biceps brachii during the upward phase of the bicep curl?
a concentric contraction- a concentric contraction involves the muscle length, shortening during a contraction! YA-trick-YA!
Does the Z line shorten during muscle contraction?
Yes, the Z line shortens during muscle contraction.
What happens to a muscle contraction if there is an excess amount of either Ca2 plus or ATP present during the contraction?
During muscle contraction the actin heads pull the sarcomere closed
The muscle decreases in muscle length during contraction but tension is the same?
Isotonic contraction
What are the differences between the a and i bands in terms of their function and structure?
The A band is the dark band in a sarcomere that contains thick myosin filaments and does not change length during muscle contraction. The I band is the light band that contains thin actin filaments and shortens during muscle contraction. The A band provides stability and structure, while the I band allows for muscle contraction and relaxation.
What band does not change its length during shortening of the sarcomere?
The thick filaments (made of myosin) do not change length during shortening of the sarcomere. They slide past the thin filaments (made of actin) to generate muscle contraction.
During muscle contraction....... attach to ...............?
Troponin
In muscles chemical energy changes to what during contraction?
Muscles turn chemical energy into heat and work during contraction. Straight from the science book.
What band shortens during skeletal muscle contraction?
during skeletal muscle contraction ,I band and H zone shortens. Sarcomeres
