Put the following phrases in proper order to describe what occurs at the neuromuscular junction to trigger muscle contraction:
I. Receptor sites on sarcolemma.
II. Nerve impulse.
III. Release of Ca+2 from sarcoplasmic reticulum
IV. The neurotransmitter acetylcholine is released
V. Sarcomere shortern
VI. Synaptic cleft
VII. Spread of impulses over sarcolemma on T-tubules
(a) II, IV, I, VI, VII, III, V            (b) II, IV, VI, I, VII, III, V
(c) I, II, III, IV, V, VI, VII             (d) VII, VI, V, IV, III, II, I

Concept Questions :-

Excitation Contraction Coupling I
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Go through the following diagram describing muscle contraction:

Now identify A to E:
(a) A - Cross bridge, B - Cross bridge formation, C - Breaking of cross bridge, D - Sliding (rotation), E - ATP
(b) A - Cross bridge, B - Cross bridge formation, C - Sliding / rotation, D - Breaking of cross bridge, E - ATP
(c) A - Cross bridge, B - Breaking of Cross bridge, C - sliding / rotation, D - Cross bridge formation, E - AMP
(d) A - Cross bridge, B - Cross bridge formation, C - Sliding / rotation, D - ADP, E - Breaking of cross bridge

Concept Questions :-

Sliding Filament Theory
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The muscle band that remains unchanged during muscle contraction and relaxation of the skeletal muscle is:

(a) I                      (b) A                     (c) H                     (d) Z-line

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The compound or pigment acting as an oxygen store in skeletal muscles is:

(a) Myoglobin                                    

(b) Haemoglobin

(c) Myokinase or ATP                         

(d) Cytochrome

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I. Number of mitochondria less.
II. Number of mitochondria more
III. Sarcoplasmic reticulum is abundant
IV. Myoglobin content high
V. Sarcoplasmic reticulum moderate
VI. Aerobic muscles
VII. Depend on anaerobic respiration for energy
VIII. Less myoglobin content
A. Red muscles B. White muscles
Identify above (I to VIII) traits as characteristic of A and B types of muscles:
(a) A - I, III, VII, VIII; B - II, IV, V, VI
(b) A - II, IV, V, VI; B - I, III, VII, VIII
(c) A - I, III, IV, VII; B - II, V, VI, VIII
(d) A - II, V, VI, VIII; B - I, III, IV, VII

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How many bones make up the human skeleton?

(a) 948                 (b) 96                             (c) 796                 (d) 206

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Number of bones in human axial skeleton is:

(a) 80                             (b) 106                 (c) 206                 (d) None of these

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Match Column-I with Column-II:
          Column-I                                              Column-II (Number of bones)
   A. Cranium / Brainbox                                            I. 22
   B. Skull (Cranial and facial bones)                           II. 8
   C. Face                                                                 III. 14
   D. Hind limb                                                          IV. 12 pairs
   E. Ribs                                                                  V. 30
(a) A - I, B - II, C - III, D - V, E - IV             (b) A - II, B - I, C - III, D - V, E - IV
(c) A - I, B - II, C - III, D - IV, E - V             (d) A - V, B - IV, C - III, D - II, A - I

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Human skull is:

(a) Dicondylic        (b) Monocondylic   (c) Procoelous       (d) Hetercoelous

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Which of the following statements about human vertebral column is false:

(a) Vertebral column consists of 26 vertebrae

(b) It is ventrally placed

(c) It extends from the base of skull and constitutes the main framework of the trunk

(d) Neural canal in vertebra is the passage for spinal cord

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