41. The $$H$$-zone in the skeletal muscle fibre is due to:

A The central gap between myosin filaments in the $$A$$-band
B The central gap between actin filaments extending through myosin filaments in the $$A$$-band
C Extension of myosin filaments in the central portion of the $$A$$-band
D The absence of myofibrils in the central portion of $$A$$-band
Answer :   The central gap between actin filaments extending through myosin filaments in the $$A$$-band
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42. Total number of bone in Appendicular skeleton of rabbit

A 128
B 120
C 80
D 37
Answer :   128
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43. Which of the following diseases is an autoimmune disorder?

A Gout
B Myasthenia gravis
C Arthritis
D Osteoporosis
Answer :   Myasthenia gravis
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44. Cross bridge are formed during

A Muscle contraction.
B Nervous Contraction.
C Tissue regeneration.
D All of the above
Answer :   Muscle contraction.
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45. 5 pairs of false ribs present in

A Man
B Rabbit
C Frog
D None of the above
Answer :   Man
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46. Greater trochanter occurs in

A Humerus
B Radius
C Ulna
D Femur
Answer :   Femur
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47. Strongest muscles

A Thigh muscle
B Leg muscle
C Arm muscle
D Jaw muscle
Answer :   Jaw muscle
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48. Elbow joint is an example of:

A hinge joint
B gliding joint
C ball and socket joint
D pivot joint
Answer :   hinge joint
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49. Belly is

A Upper part of muscle
B Middle part of muscle
C Lower part of muscle
D None of the above
Answer :   Middle part of muscle
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50. Out of $$'X'$$ pairs of ribs in humans only $$'Y'$$ pairs are true ribs. Select the option that correctly represents values of $$X$$ and $$Y$$ and provides their explanation:

A $$X = 12, Y = 5$$    True ribs are attached dorsally to vertebral column and sternum on the two ends
B $$X = 24, Y = 7$$    True ribs are dorsally attached to vertebral column but are free on ventral side
C $$X = 24, Y = 12$$    True ribs are dorsally attached to vertebral column but are free on ventral side
D $$X = 12, Y = 7$$    True ribs are attached dorsally to vertebral column and ventrally to the sternum
Answer :   $$X = 12, Y = 7$$    True ribs are attached dorsally to vertebral column and ventrally to the sternum
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