Which of the following is also present in thin filament?
a) troponin
b) tropomysin
c) myosin
d) both a and b
Explanation: Troponin and tropomyosin are two proteins that are present on the thin filaments of the muscle cells and help in the contraction of muscles.
Which of the following proteins help in the contraction of muscle fibre?
a) actin
b) myosin
c) both a & b
d) none of them
Which filament ha a tail terminating in two globular heads and connect thick and thin filament during contraction?
a) thick filament
b) thin filament
c) both a and b
d) none of them
Explanation: these heads forming cross bridge between thick and thin filament
The currently popular model of muscular fibre contraction is called…….
a) fluid mosaic model
b) sliding filament hypothesis
c) movement hypothesis
d) none of these
Explanation: The sliding filament theory explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement.
Sliding filament hypothesis is proposed by…
a) H. E. Huxley
b) A. F. Huxley
c) J. Watson
d) both a and b
Which of the following cause a reorientation of certain components in the thin filament?
a) sodium ions
b) calcium ions
c) chloride ions
d) potassium ions
Explanation: calcium ions release from sarcoplasmic reticulum
