Question

The sarcoplasmic reticulum of skeletal muscle is a

• A. form of rough endoplasmic reticulum
• B. site of glycogen storage and degradation to glucose
• C. site into which calcium is released during muscle relaxation
• D. site of a calcium-binding protein and a calcium-activated ATPase ,

Answer 1

Answer: (D)

The sarcoplasmic reticulum is a modified smooth endoplasmic reticulum. That serves alternatively as a storage site and a source of cellular calcium.