a. sarcolemma
b. sarcomere
c. myofibrils
d. transverse tubules
2006-12-15 06:52:34 · 4 answers · asked by Jennifer E 1 in Science & Mathematics ➔ Biology
D, T-tubules. Definitely not A, the answer is 100% D.
2006-12-15 06:55:36 · answer #1 · answered by pdigoe 4 · 0⤊ 0⤋
the answer is (d) transverse tubules.
The process is called excitation-contraction coupling. An action potential is triggered in the skeletal muscle cell by a neuron. The action potential spreads across the cell membrane, including down the t-tubules, which are continuations of the membrane. In the membrane of the tubules are receptors which cause calcium to be released into the muscle myoplasm. The calcium then allows the interaction of the muscle contractile proteins actin and myosin, and thus contraction ensues.
2006-12-15 14:57:52 · answer #2 · answered by kt 7 · 0⤊ 0⤋
Transverse tubules, which are extensions of the sarcolemma into the muscle.
2006-12-15 14:58:45 · answer #3 · answered by Black Dragon 2 · 0⤊ 0⤋
a
2006-12-15 14:54:28 · answer #4 · answered by Underlined name. 4 · 0⤊ 0⤋