QuestionSBA
QuestionChoice
Alpha actinin tethers actin to the sarcomere.
10003471
a
Alpha-actinin
QuestionChoice
Myosin fibres form the thick filaments of the sarcomere. In the resting state, myosin is bound to tropomyosin and is inhibited from binding to the myosin binding site on actin.
10003475
e
Myosin
QuestionChoice
Troponin C (TnC) binds calcium and causes a conformational change in the myosin-tropomyosin complex by inhibiting the Troponin I (TnI) inhibition of the actinomyosin ATPase.
10003472
b
Troponin C
QuestionChoice
Troponin I (TnI) binds to the actinomyosin ATPase and inhibits myosin from forming a cross-bridge with actin, thus inhibiting muscle contraction.
10003473
c
Troponin I
QuestionChoice
Tropomyosin binds to myosin forming a myosin-tropomyosin complex. When tropomyosin detaches from myosin, myosin can form a cross-bridge with actin causing muscle contraction.
10003474
d
Tropomyosin
Concept
Chapter
2693
4170
Muscle contraction
Topic
206
Physiology
13241
Which molecule tethers actin to the sarcomere?
a