Question

Which of the following is not correct with regards to excitation-contraction coupling?

• 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

When we perform a movement like flexing your elbow, your brain decides that you want to flex your elbow, and sends a signal from the CNS down to the peripheral motor neurons, which then innervate the muscles of our body.Each motor neuron and the muscle it innervates are known as a motor unit. The tiny gap between the innervating neuron and the sarcolemma of the muscle fibre it is innervating, is called the neuromuscular junction or the motor end plate.