Question

Which of the following statements is not correct?

• A. Action potentials are converted into contractions
• B. Action potentials travel into the interior of the muscle fiber by T tubules
• C. Triads in skeletal muscle consist of 2 T-tubules and a cisternae
• D. Action potential travels down a T tubule it causes a voltage sensitive protein to change shape. this change shape opens the calcium release channel.

Answer 1

The correct option is B

Action potentials travel into the interior of the muscle fiber by T tubules

Transverse tubules (T-tubules) are extensions of the sarcolemma (muscle cell membrane) that penetrate into the centre of skeletal and cardiac muscle cells.
The tiny gap between the innervating neuron and the sarcolemma of the muscle fibre it is innervating is called the synaptic cleft.