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Examine the given diagrammatic view of human skull given below and identify the skull bones labelled from A-D.

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Important Questions on Locomotion and Movement

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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 2>Q 17
The H-zone in the skeletal muscle fibre is due to
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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 2>Q 18
Smooth muscles are
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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 2>Q 19
During contraction of skeletal muscle, which of the following does not occur?
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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 2>Q 20
Which of the following statements are correct regarding muscle proteins?
(i) Actin is a thin filament and is made up of two F-actins
(ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin
(iii) Myosin is a thick filament which is also a polymerised protein
(iv) The globular head of meromyosin consists of light meromyosin (LMM)
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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 2>Q 21
Fill up the blanks in the following sentence by selecting the correct option.
The thin filaments of myofibril contain __(i)__ actin and two filaments of __(ii)__ protein along with __(iii)__ protein for masking binding site for myosin.
  (i) (ii) (iii)
(a) 1F troponin tropomyosin
(b) 1F tropomyosin troponin
(c) 2F troponin tropomyosin
(d) 2F tropomyosin troponin
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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 2>Q 22
Locomotion is influenced by
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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 3>Q 1
During contraction of muscles:
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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 3>Q 3

Read the following statements and choose the correct option:

Statement I: During contraction of skeletal muscles, calcium binds with troponin so that myosin head binding sites on actin are exposed.

Statement II: The process of muscle contraction continues till sodium ions are pumped back to sarcoplasmic reticulum, resulting in masking of actin filaments which results in the return of Z-lines back to their original position.