Human muscles has evolved earlier from
a) fishes
b) reptiles
c) protozoa
d) all of these
Human exoskeleton has evolved from some primitive fishes about
a) 100 million year ago
b) 200 million year ago
c) 300 million year ago
d) 400 million year ago
In the following, which one is a major role in contraction of sarcomere after a nerve impulse has arrived
a) ionized calcium
b) cross bridge
c) tropomyosin
d) troponin
A band consists of………….
a) thin filament
b) thick filament
c) both thin and thick filament
d) none
A muscles fiber contracts the length of sarcomere…………………..
a) increase
b) decrease
c) remains unchanged
d) none of these
As a sarcomere contract the length of H band
a) increase
b) decrease
c) remain unchanged
d) none of these
