time 3. The above figure shows [Ca2+] within the sarcoplasm (cytoplasm of a muscle celI) of a muscle fiber (blue) and muscle force (red). Why does the muscle force plateau as [Ca2+] increases? a. Ca2+...

ignore the highlighted region.

Extracted text: time 3. The above figure shows [Ca2+] within the sarcoplasm (cytoplasm of a muscle celI) of a muscle fiber (blue) and muscle force (red). Why does the muscle force plateau as [Ca2+] increases? a. Ca2+ does not affect muscle force. b. The muscle cell eventually habituates to the level of Ca2+ and stops responding. c. There is more Ca2+ in the sarcoplasm than can bind to available actin binding sites. d. Ca2+ is being absorbed by the Sarcoplasmic Reticulum at a higher rate than its release Sarcoplasmic [Ca2+] / Muscle Force