Support & Movement — Biology MCQs (Class 12)
Free chapter-wise Biology MCQs with answers for MDCAT, FSc and entry tests.
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#25 The sarcomere is the region of a myofibril between two successive
A) A-lines
B) Z-lines
C) A-bands
D) H-zones
Answer: B
#26 Sudden and involuntary contractions of one or more muscles is
A) Cramp
B) Tetany
C) Muscle fatigue
D) Tetanus
Answer: A
#27 If the bone ends penetrate the skin and form a wound, the fracture is called
A) Simple fracture
B) Compound fracture
C) Multiple fracture
D) None of these
Answer: B
#28 The muscle fibre contains many nuclei, a large number of mitichondria and is surrounded by a membrane, called
A) Sarcolemma
B) Periosteum
C) Perichondrium
D) Pericardium
Answer: A
#29 In skeletal muscle, calcium facilitates contraction by binding to
A) Tropomyosin
B) Actin
C) Troponin
D) Myosin
Answer: C
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