What happens when a muscle contracts?

Looking at a diagram of muscle cells you can identify: Z lines, H zone, I band, and A band. The Z lines move closer together, H zone becomes more narrow, as does the I band, and the A band remains the same width. Overall the sarcomere has shortened.

Answered by Emily M. Biology tutor

2564 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Describe 3 adaptations the ileum has that allow it to maximise the absorption of nutrients from its lumen into surrounding blood vessels.


What is mRNA splicing and why is it important?


Outline the reasons why insects and other animals need well-developed transport systems (3 marks)


How does the DNA molecule affect the function and structure of an organism?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences