Which statement related to calcium in skeletal muscles is true? a. In a muscle fiber at rest, calcium is higher in the cytoplasm than in the sarcoplasmic reticulum. b. The DHP receptor is found in the sarcoplasmic reticulum membrane. c. Calcium triggers the interaction of actin and myosin and the sliding of filaments. d. DHP and ryanodine receptors are not physically connected. e. The DHP receptor is a calcium channel.
