1. Muscle Cell Contraction
Prezi:
Neurotransmitter released into synaptic cleft
“Function of neuromuscular junction” saladin ch 11
“Action Potential and Muscle Cell” ch 11 saladin

3. Contraction: How to stimulate the cell
Stimulus – Action potential
Axon terminal to neuromuscular junction
Ca++ into neuron
Acetylcholine (ACh) released into synaptic cleft
5. Na+ into muscle cell – depolarization
6. Action potential on muscle cell
7. Following A.P. K+ leaves - repolarization

4. Depolarization/Repolarization????
Na+ through sarcolemma– depolarization
Action potential
K+ leaves – repolarization…
video

5. Contraction: How muscle cell shortens
8. Action potential
9. SR releases Ca++
10. Ca++ attaches to actin
11. Binding sites open for myosin heads
12. SLIDING FILAMENT THEORY

6. SLIDING FILAMENT THEORY
Contraction: How muscle cell shortens microscopically
SLIDING FILAMENT THEORY

7. Relaxation: Need to get myosin heads to detach
Stimulus stops
Acetylcholinesterase (AChE)
Stop A.P.
Ca++ reabsorbed
Heads detach
Na+/K+ pump

8. Post Muscle Contraction
This simple process occurs in just a few thousandths of a second!!!
Summary New Summary:McGraw Hill
PROJECT TIME!!!
Student Example
Beth Dietzen: Prezi
Sam B photostory