2. Function of Muscles

3. Characteristics of Muscles pg 179
3 types:
muscle cell = muscle fiber
All muscles share some terminology
Prefix myo refers to muscle
Prefix mys refers to muscle
Prefix sarco refers to flesh

4. 1. Smooth Muscle
2. Cardiac Muscle
3. Skeletal Muscle
Figure 6.2a

5. Quick Write Smooth Skeletal Cardiac
Fill in table distinguishing between the 3 muscle types:
Smooth
Skeletal
Cardiac

6. Connective Tissue Wrappings of Skeletal Muscle
Endomysium –
Perimysium –
Epimysium –
Figure 6.1

7. Skeletal Muscle Attachments
Muscle attachment sites:
Cartilage-
Tendon –
Aponeurosis –

9. Microscopic Anatomy of Skeletal Muscle 2 slides
Cells are multinucleate
Nuclei are beneath the sarcolemma
Figure 6.3a

10. Myofibril Bundles of myofilaments I band = light band
Z disc at midline
Actin only
A band = dark band
Actin and Myosin
H zone/Bare Zone at midpoint
Lacks actin
Figure 6.3b

11. Microscopic Anatomy of Skeletal Muscle
Sarcomere:
Contractile unit (Z disc to Z disc)
Figure 6.3b

13. Microscopic Anatomy of Skeletal Muscle
Organization of the sarcomere:
Thick filaments = myosin filaments (protein)
Thin filaments = actin filaments (protein)
Figure 6.3c

14. Microscopic Anatomy of Skeletal Muscle (good)(2 slides)
Myosin heads pull
Myosin and actin overlap
Figure 6.3d

15. Microscopic Anatomy of Skeletal Muscle
Sarcoplasmic reticulum (SR) – for storage of calcium
Figure 6.3d

16. McGraw Review Video

17. Modeling A Sarcomere w/Clay
Make a sarcomere and label on a piece of paper
Myosin
Actin
Z disc
I band
A band
H zone

18. Draw a Sarcomere
Label: Z disc, H zone, A band, I band, M line, actin and myosin

19. So now we know the microscopic anatomy of muscle cell……
So now we know the microscopic anatomy of muscle cell…….so what you may ask??
Who cares???
It will help us understand the ____________

20. Muscle Cell Contraction
Review website
Prezi:
Neurotransmitter released into synaptic cleft