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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

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

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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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
Transcribed Image 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
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