T-tubules can conduct action potentials because
A contracture is when there is a lack of ATP in a muscle; this would
Please re write your question, not sure what you are asking, Ttubules are the spaces in between the end plates of the sarcoplasmic riticulum also called the terminal cisterna. The ttubule is a continuation fo the muscle fiber membrane therefore making it continuous with the extracellular fluid. This makes the ttubule able to communicate with the ouside They rapidly move action potentials that originate at the neuromuscular junction into the interior of the muscle fiber.
Lack of ATP-- this would cause the muscle to possible be locked into a power stroke and unable to relaease, however this does not happen often for the single cause of lack of ATP Most studies show that even intense exercise uses only 30% of the atp in a muscle fiber, the condition must come from other changes in the muscle.
Found something else that might help. The release of myosin heads from actin requires ATP binding, energy from ATP is required for the power stroke. Relaxation does not directly require ATP but relaxation will not occur unless Ca2 is pumped back into the sarcoplasmic reticulium using Ca2-ATPase.
prevent muscle relaxation and lead to sustained muscle contraction.
To understand why T-tubules can conduct action potentials, we need to have a basic understanding of the structure of skeletal muscle cells. Skeletal muscles are made up of individual muscle fibers, which are long and cylindrical cells. Within each muscle fiber, there are specialized structures called T-tubules.
T-tubules are intions of the muscle cell membrane that penetrate deep into the interior of the cell. They are in close proximity to another structure called the sarcoplasmic reticulum, which is an interconnected network of membrane-bound compartments that store and release calcium ions.
When a muscle fiber is stimulated, an action potential is generated at the motor end plate, which is where the nerve meets the muscle. This action potential then propagates along the muscle fiber, traveling along the T-tubules and ultimately reaching the sarcoplasmic reticulum.
The T-tubules play a crucial role in the contraction of skeletal muscle. They allow the action potential to quickly spread into the interior of the muscle fiber, ensuring that all parts of the cell receive the signal to contract at the same time. This synchronized contraction is essential for the muscle to generate force efficiently.
The T-tubules are able to conduct action potentials because they are essentially extensions of the muscle cell membrane. They contain the same ion channels as the cell membrane, which allow for the movement of ions and the propagation of electrical signals. This allows the action potential to rapidly spread along the T-tubules, ensuring efficient and coordinated muscle contraction.
In summary, T-tubules conduct action potentials in skeletal muscle cells because they are extensions of the muscle cell membrane and contain the necessary ion channels to propagate electrical signals. They play a vital role in synchronizing muscle contractions and ensuring efficient force generation.