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

Active sites on the actin filaments are exposed when the

A
Mg+ ions bind with troponin
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Ca++ ions bind with tropomyosin
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Ca++ ions bind with troponin
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Mg++ ions bind with troponin
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C Ca++ ions bind with troponin
  • When an electrical signal passes down the motor nerve to the muscle it causes the depolarisation of the muscle membrane.
  • This triggers the release of calcium ions into the muscle interior where they bind to troponin.
  • This causes the tropomyosin to shift from the face of the actin filament to which myosin heads needs to bind to produce contraction.
  • Thus, the active sites on actin filaments are exposed.

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