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. Skeletal Muscle Characteristics

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

6. Skeletal Muscle Attachments
Muscle attachment sites:
connective tissue attachments
Tendon –
Aponeuroses –

9. 2. Smooth Muscle Characteristics
Figure 6.2a

10. 3. Cardiac Muscle Characteristics
Figure 6.2b

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

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

13. Microscopic Anatomy of Skeletal Muscle
Myofibril
Bundles of myofilaments
I band = light band
Z disc at midline
A band = dark band
H zone at midpoint
M Line
Figure 6.3b

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

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

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

18. Microscopic Anatomy of Skeletal Muscle
At rest: bare zone
lacks actin filaments (H zone)
Sarcoplasmic reticulum (SR) – for storage of calcium
Figure 6.3d

19. McGraw Review Video

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

21. 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 ____________

22. Muscle Cell Contraction
Review website
Prezi: