Essay
Essay on the topic muscle contraction
- Course
- Institution
- Book
Easy understanding of muscle contraction mechanism
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Lehninger Principles of Biochemistry 7th Edition Nelson Test Bank
-
Test Bank for Lehninger Principles of Biochemistry, 8th Edition (Nelson, 2022), Chapter 1-28 | All Chapters
-
Respiration and Energy transfer
Seller
Follow
gowrinandana
Content preview
Mechanism of muscle contraction Muscle is a contractile tissue helps in locomotion, maintenance of
posture.
They serve as the biological system for converting chemical energy to
mechanical energy
Muscle contraction is the shortening of myofibrils in response to
nervous stimulation.
During this the actin filaments slide over myosin filaments and link with
them forming actomyosin complexes
During muscular relaxation they delink and move away from each other
Mechanism of Muscle contraction
o Ultrastructural changes:
o It include the regular and cyclic attachment and detachment
between the myosin cross-bridges and the actin filaments .
o It is best explained by the Sliding-Filament theory proposed by
Huxley and J.Hanson
o According to this theory, muscle fibres become short and thick
during contraction by the shortening of their sarcomeres due to
sliding of myofilaments
o Actin filaments slide inward from adjacent Z-zones to the H zone
o In the H zone they completely overlap the myosin filaments and
link with them, forming actomyosin chains
o This inward movement of actin filaments brings Z zone closer
together
o So the length of I- band and that of sarcomere(region between
two adjacent Z-zones) becomes shorter.
Cross-bridge cycle
o The attachment- detachment cycle of the myosin head
o During muscular contraction, the head of the myosin filament
functions as a hook. It attaches to a binding site of F-actin, forming
a cross-bridge.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller gowrinandana. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75759 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now