Sarcoplasmic reticulum stores………
a) sodium
b) chloride
c) calcium
d) phosphate
Explanation: calcium is required for muscle fibre contraction
The nerve impulse is carried through the…….. to adjacent sarcoplasmic reticulum in muscle fibre.
a) nucleus
b) T-tubule
c) sarcolemma
d) sarcoplasm
Explanation: T-tubules are invaginations of the plasma membrane, which are present exclusively in striated muscle.
Why muscle cells may appear red?
a) due to the presence of hemoglobin
b) due to the presence of myoglobin
c) due to the presence of caretone
d) all of these
Explanation: myoglobin is an oxygen storing pigment protein
Which of the following is store muscle fibre?
a) starch
b) glucose
c) sucrose
d) glycogen
Explanation: glycogen is a polysaccharide and a storage bio-molecule, convert back to glucose to produce ATP
The sarcoplasm of the muscle fibre contains many contractile element called
a) actin
b) myosin
c) troponin
d) myofibril
What is the diameter of myofibril?
a) 1-5µm
b) 1-2µm
c) 5-10µm
