LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
in Biology by (52.0k points)
closed by

How does calcium affect the process of muscle contraction?

1 Answer

+1 vote
by (55.4k points)
selected by
Best answer

(i) The sarcoplasmic reticulum releases the stored Ca++ which binds with the specific sites present on the troponin component of the thin filament. 

(ii) As a result, conformational change occurs in the troponin molecule and the active sites present on the F-actin molecules are exposed. 

(iii) These sites are specific to myosin head which exhibits Mg++ dependent ATPase activity. 

(iv) During the relaxation of the muscle, the Ca++ is pumped back into the sarcoplasmic reticulum. 

(v) As a result the troponin component becomes free to mask the active sites for myosin head. 

(vi) The cross bridge breaks and thin filament occupies its normal position and muscle relaxes.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.