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Chapter 12, part A Muscles About this Chapter Muscle types What muscles do How muscles contract Contraction to locomotion Roles of smooth muscles Muscles Contract! Generate motion Generate force Generate heat Support Muscle Types Cardiac – heart Smooth – internal organs
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Chapter 12, part A
Muscles
About this Chapter
- Muscle types
- What muscles do
- How muscles contract
- Contraction to locomotion
- Roles of smooth muscles
Muscles
- Contract!
- Generate motion
- Generate force
- Generate heat
- Support
Muscle Types
- Cardiac – heart
- Smooth – internal organs
- Skeletal – "voluntary"
- Attach to bone
- Move appendages
- Support body
- Antagonistic pairs
- Flexors
- Extensors
PLAY
Animation: Muscular System: Anatomy Review: Skeletal Muscle Tissue
Muscle Types
Figure 12-1: Three types of muscles
Skeletal Muscle Anatomy
- About 40% body mass
- Muscle fibers – cells
- Fascicle – bundle
- Motor unit
- Muscle
- sheath
- Attach to tendons (which attach to bone)
Skeletal Muscle Anatomy
Figure 12-3a-1: ANATOMY SUMMARY: Skeletal Muscle
Skeletal Muscle Anatomy
Figure 12-3a-2: ANATOMY SUMMARY: Skeletal Muscle
Muscle Fiber Structure
- Multiple nuclei
- Sarcolemma
- T-tubules
- Sarcoplasmic reticulum
- Sarcoplasm
- Mitochondria
- Glycogen & ions
- Myofibrils
Muscle Fiber Structure
Figure 12-3b: ANATOMY SUMMARY: Skeletal Muscle
Muscle Fiber Structure
Figure 12-4: T-tubules and the sarcoplasmic reticulum
Myofibrils: Site of Contraction
- Actin – "thin fibers"
- Tropomysin
- Troponin
- Myosin – "thick fibers"
- Tinin – elastic anchor
- Nebulin – non-elastic
Myofibrils: Site of Contraction
Figure 12-3c-f: ANATOMY SUMMARY: Skeletal Muscle
Sarcomere: Organization of Fibers
- Z disks
- I band
- A band
- H Zone
- M line
- Titin
- Nebulin
Figure 12-5: The two- and three-dimensional organization of a sarcomere
Sarcomere: Organization of Fibers
Figure 12-6: Titin and nebulin
