1. What have we been learning??
Types of Muscle
Muscle Structure
Muscle Stimulation

2. Types of Muscle

3. What are the 3 types of muscle?

4. Muscle Structure

5. Put these in order from outer to inner
Connective Tissue
Perimysium
Fascia
Epimysium
Endomysium
Muscle Groups
Fascicles
Muscle Fibers
Myofilaments
Myofibrils
CHECK WITH A PARTNER

6. Muscle Structure
What is this?

7. Let’s look inside a myofibril

8. Inside a Myofibril

9. Muscle Stimulation

10. What’s the difference between motor unit & neuromuscular junction?
Motor Unit: one neuron & the muscle fibers it controls
Neuromuscular Junction: one neuron and one muscle fiber.

11. Let’s Label the Neuromuscular Junction
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12. Can a neuron contain muscle fibers??
What are the circle like structures in the neuron?
What is the muscle fiber in this picture?

13. Muscle Stimulation Process
Ca++
Impulse travels down neuron
Once an impulse travels down the neuron, where does Calcium (Ca++) enter the neuron?
What does the Calcium do?

14. Muscle Stimulation Process
3. The neurotransmitters released from the vesicles do what?
Attach to muscle fiber receptors

15. Muscle Stimulation Process
4. What is entering the muscle fiber?
Sodium (Na+)

16. Muscle Stimulation Process
5. What happens to the neurotransmitters after sodium enters the muscle cell? - Travel back into vesicles

17. Muscle Stimulation Process
6. Muscle Impulse travels INSIDE muscle fiber to myofibril. 7. What is released from Sarcoplasmic Reticulum (SR)? Calcium

18. Muscle Stimulation Process: Sliding Filament Theory
1. Ca++ released from SR attaches to what myofilament? - actin

19. Muscle Stimulation Process: Sliding Filament Theory
2. Myosin heads attach to actin at binding sites

20. Muscle Stimulation Process: Sliding Filament Theory
3. Myosin pushes actin back (Walk along actin)