Which of the following is true for the following spanning membrane proteins?
A. The mAChR (muscarinic Acetylcholine Receptor) is a spanning membrane protein located in the membranes of the sarcoplasmic reticulum.
B. The Ryanodine Receptor is a voltage-sensitive spanning membrane protein located in the membranes of the transverse tubules.
C. The Calcium Pump ATPase is a spanning membrane protein that is located in the membranes of the sarcoplasmic reticulum