Which is a TRUE statement about excitation-contraction coupling?
A)In skeletal muscle cells,it requires the influx of extracellular calcium ion.
B)In smooth muscle cells,it must be preceded by an action potential in the cell membrane.
C)In all kinds of muscle it requires the entry of calcium from the extracellular fluid.
D)Calcium-induced calcium release plays a role in cardiac muscle cells,as well as in some smooth muscle cells.
E)In skeletal muscle cells,excitation-contraction coupling begins when an action potential propagates along the sarcoplasmic reticulum membrane.

Question

Which is a TRUE statement about excitation-contraction coupling?
A)In skeletal muscle cells,it requires the influx of extracellular calcium ion.
B)In smooth muscle cells,it must be preceded by an action potential in the cell membrane.
C)In all kinds of muscle it requires the entry of calcium from the extracellular fluid.
D)Calcium-induced calcium release plays a role in cardiac muscle cells,as well as in some smooth muscle cells.
E)In skeletal muscle cells,excitation-contraction coupling begins when an action potential propagates along the sarcoplasmic reticulum membrane.

Quizplus · Accepted Answer

Calcium-induced calcium release is a mechanism that is indeed present in cardiac muscle cells and in some types of smooth muscle cells. This process involves the entry of a small amount of calcium into the cell, which then triggers the release of more calcium from the sarcoplasmic reticulum, leading to muscle contraction.

Which Is a TRUE Statement About Excitation-Contraction Coupling