1. Skeletal Muscle Contraction p.290

3. Skeletal Muscle Contraction How many muscle fibers are connected to motor neuron #1?

4. Skeletal Muscle Contraction Motor neuron: Neuron that attaches to a skeletal muscle Synapse: functional connection between axon end and muscle fiber

5. Skeletal Muscle Contraction How is the message sent from the axon end to the muscle fiber?? by neurotransmitters ACh

6. Animation of synapse at work… http://highered.mcgraw-hill.com/olc/dl/120107/bio_c.swf

7. Skeletal Muscle Contraction

8. Skeletal Muscle Contraction Motor end plate: Site where axon and muscle fiber meet Sarcolemma folded Nuclei and mitochondria are abundant

9. Skeletal Muscle Contraction Synaptic cleft : Small gap between membrane of neuron and membrane of muscle fiber

10. HW due on TUESDAY p. 341 (6-12)