Match column I with II and select the correct option from the codes given below. Column I Column II ( a ) Structrual and functional unit of a myofibril ( i ) H-zone ( b ) Protein of thin filament ( i i ) Myosin ( c ) Protein of think filament ( i i i ) Sarcomere ( d ) The central part of thick filament not overlapped by thin filament ( i v ) Actin

( a ) - ( i i i ) , ( b ) - ( i v ) , ( c ) - ( i i ) , ( d ) - ( i )

( a ) - ( i ) , ( b ) - ( i i ) , ( c ) - ( i i i ) , ( d ) - ( i v )

( a ) - ( i ) , ( b ) - ( i i i ) , ( c ) - ( i i ) , ( d ) - ( i v )

( a ) - ( i ) , ( b ) - ( i v ) , ( c ) - ( i i i ) , ( d ) - ( i i )

Choose the incorrect statement about muscle contraction from the following:

Sodium ions are released from sarcoplasm

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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 2>Q 20

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Earn 100

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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Important Questions on Locomotion and Movement

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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.

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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 3>Q 6

Match column I with II and select the correct option from the codes given below.

	Column I		Column II
$(a)$	Structrual and functional unit of a myofibril	$(i)$	H-zone
$(b)$	Protein of thin filament	$(i i)$	Myosin
$(c)$	Protein of think filament	$(i i i)$	Sarcomere
$(d)$	The central part of thick filament not overlapped by thin filament	$(i v)$	Actin

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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 3>Q 8

During muscular contraction, which of the following events occur?
(i) H-zone disappears
(ii) A-band widens
(iii) I-band reduces in width
(iv) Width of A-band is unaffected
(v) M-line and Z-line come closer

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Biology Crash Course NEET>Chapter 20 - Locomotion and Movement>Level 3>Q 9

Which of the following is true regarding thick filaments?