Sliding filament model
- Created by: vezting
- Created on: 20-04-16 14:31
View mindmap
- sliding filament model
- myofibrils
- contain bundles of thick and thin filaments.
- thick filaments are made of myosin
- thin filaments are made of actin
- actin and myosin are both proteins
- made of many short units called sarcomeres
- end of sarcomere is marked with Z line
- middle is marked with an M line
- the area surrounding the M line is the H zone
- the H zone only contains myosin fillaments
- where the thin fillaments overlap the thick filament its called the A band
- light bands only containing actin is I band
- sliding action
- 1: CA2+ from depolarisation binds to troponin
- 2: this pulls tropmyosin out of the binding site, allowing actin-myosis cross-bridges to form
- 3: CA2+ activates ATPase break down
- 4: ATP then provides energy to break cross bridge
- 5: ATP moves myosin head to the side, pulling actin filaments along
- in contraction
- A bands stay same length
- i band gets shorter
- H zone gets shorter
- myofibrils
Comments
No comments have yet been made