Chief source of energy for muscle contraction is:
A.Plasma
B.Fat
C.Protein
D.Glycogen
Category: Muscle Contraction Physiology Mcqs
During biochemical events or muscle contraction which of these processes occur:
A.Breakdown of ATP into ADP
B.Breakdown of creatine phosphate into creatine + H2PO4
C.Breakdown of muscle glycogen into lactic acid
D.All of these processes
Dragging of actin filaments towards ‘M’ line is termed as:
A.Power stroke
B.Refractory stroke
C.Recovery stroke
D.None of these
Which of these structures over myosin help in contraction of the muscle fibre:
A.Cross bridges over spur
B.Tropomyosin protein
C.Both (a) & (b)
D.None of these
Formation of lactic acid from pyruvic acid during muscle contraacton is catelyzed by which of these enzymes:
A.Glycokinase
B.Phosphohexoisomerase
C.Lactic dehydrogenase
D.All of these enzymes mentioned
The ‘A’ band in myofibril occupies:
A.2/3rd of length of sarcomere so that muscle shortens by 1/3rd of its length during contraction
B.1/3rd of length of sarcomere so that muscle shortens by 2/3rd of its length during contraction
C.1/2 of length of sarcomere so that the muscle shortens 1/2 of it
D.3/4th of the length of sarcomere so that the muscle shortens by 1/4th of its length during contraction
Flexing or bending of our arm is done by:
A.Biceps
B.Triceps
C.Both (a) & (b)
D.None of these
Functional unit of contractile system in a striped muscle is:
A.Sarcomere
B.A-band
C.Z-band
D.Myofibril
Paralysis occurs in the muscles by:
A.Cut off in its motor nerve supply
B.Cut off in its sensory nerve supply
C.Both (a) & (b)
D.None of these
The decomposition of lactic acid is done by:
A.Converting it to glycogen
B.Converting it into CO2 and H2O
C.Both of these processes
D.None of these processes
