QuestionSBA
QuestionChoice
Calcium binds to the protein troponin, which is located on the thin filaments of skeletal muscle fibers. This binding triggers a conformational change in the troponin-tropomyosin complex, exposing the binding sites on actin for myosin cross-bridges. This initiates the sliding of the actin and myosin filaments, leading to muscle contraction.
10007161
a
Troponin
QuestionChoice
Calcium only binds to troponin, not any of the others.
10007165
e
All of the above
QuestionChoice
Calcium binds to troponin, not tropomyosin.
10007164
d
Tropomyosin
QuestionChoice
Calcium does not bind directly to actin, but rather to troponin.
10007162
b
Actin
QuestionChoice
Calcium does not bind directly to myosin, but rather to troponin.
10007163
c
Myosin
Concept
Chapter
2693
3966
Muscle physiology
Topic
183
Physiology & Pathology of Bone
13979
A 45-year-old man attends his GP surgery with a muscle sprain sustained after lifting weights in the gym. He is keen to know more about the physiology of skeletal muscle contraction, to avoid injuring himself again.

Which of the following biochemicals does calcium bind to during skeletal muscle contraction?
a