Asked by Haoran Huyuan on Apr 27, 2024
Verified
T tubules are invaginations of the
A) sarcoplasmic reticulum.
B) sarcomere.
C) myofibril.
D) sarcoplasm.
E) sarcolemma.
T Tubules
Tubular extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, facilitating the transmission of electrical signals.
Sarcolemma
The fine transparent tubular sheath that envelops the fibers of skeletal muscles.
Sarcoplasmic Reticulum
A network of tubules within muscle cells that stores and releases calcium ions, playing a key role in muscle contraction.
- Describe the mechanism of excitation-contraction coupling in skeletal muscle fibers.
Verified Answer
SA
Stephen ArrowsmithApr 27, 2024
Final Answer :
E
Explanation :
T tubules are invaginations of the sarcolemma, which is the cell membrane of a muscle cell. They play a crucial role in transmitting the action potential to the interior of the muscle cell, facilitating uniform contraction.
Learning Objectives
- Describe the mechanism of excitation-contraction coupling in skeletal muscle fibers.