The Lumen of the Transverse Tubules of Skeletal Muscles Contains

Question

The lumen of the transverse tubules of skeletal muscles contains
A)extracellular fluid.
B)cytosol.
C)actin.
D)myosin.
E)sarcomeres.

Accepted Answer

The transverse tubules (also known as T-tubules) of skeletal muscles are invaginations of the muscle cell membrane that allow for the rapid transmission of action potentials deep into the muscle fiber. The lumen of the T-tubules contains extracellular fluid, which is important for allowing the action potential to travel quickly and efficiently throughout the muscle fiber. The cytosol, actin, myosin, and sarcomeres are all located within the muscle fiber itself and are not present within the T-tubule lumen.