Question

Which of the following best describes the function of T-tubules?

a. transmit action potentials
b. store and release calcium ions
c. remove calcium ions from sarcoplasm
d. store and release neurotransmitter
e. all of the above

Answer 1

b. store and release calcium ions

Step-by-step explanation:

The two major functions of the T - tubules are as follows -

1. the T - tubules propagates the action potential of the plasma membrane into the muscle cells interior through the voltage - gated Na ⁺ and K⁺ channels .

2. The cation potential which is carried by the T - tubules helps to regulate the opening and the closing of the calcium ion channels present in the sarcoplasmic reticulum . The resulting change in the cytosolic calcium ions concentration triggers the contraction of the myofibrils .