wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Cross bridges of sarcomere in skeletal muscle are made up of

A
Actin
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Myosin
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
Troponin
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Tropomyosin
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B Myosin
  • Active sites for myosin (Thick filament) are present on actin which are masked by troponin in resting state. when Ca++ level increases it leads to the binding of calcium with a subunit of troponin on actin(thin) filaments and thereby remove the masking of active sites for myosin.
  • Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge. thus myosin forms cross bridges.
  • This pulls the attached actin filaments towards the centre of ‘A’ band.
  • The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction.
  • Hence cross bridges of sarcomere in skeletal muscle are made up of myosin.
  • So, the correct answer is 'Myosin'.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Skeletal Muscle
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon