Download - How Does Rigor Mortis Work?
Do Now
1. What is rigor mortis? 2. How do your muscles contract?
(what do you remember from Living Environment?)
Agenda Do Now Mini Lesson – Muscle Contractions,
Mechanism behind Rigor Mortis Practice – Graphic organizer with diagrams
& descriptions
When you want to pick something up...
Your brain sends a signal for the myosin to stick to the actin
How does the myosin stick to the actin?
Myosin heads bind to actin
Myosin heads form little “cross-bridges”
What’s the purpose of forming crossbridges?
the thick myosin bands pull the thin actin bands closer muscle contraction.
Works because of the cross bridges.
myosin
actin
How do your mucles lose the contraction?Remeber ATP from Living
Environment???ATP = Adenosine
Triphosphate
ATP Product of cellular respiration. What’s the purpose of cellular
respiration? (dust off those cob-webs) body converts glucose energy
What do you think happens when cellular respiration stops?
Cellular Respiration ATP Production Stops muscle contraction
Stop and jot
What do you think happens when cellular respiration stops?Cellular Respiration ATP Production Stops muscle
contraction
If there is no ATP, muscles stay contracted. Why, then, would rigor mortis go
away after 36 hours?? Stop and jot!!!
If there is no ATP, muscles stay contracted. Why, then, would rigor mortis go
away after 36 hours?? Autolysis - cells start breaking down.
Cell wall breaks down cell contents leak out.
Muscles do not relax, but are broken down
Autolysis causes...
Muscles to become softMuscles don’t relax, but break
down. – important distinction!
Lets practice this! Make a graphic organizer explaining the process
of muscle contraction what goes wrong to cause rigor mortis
What is a graphic organizer?