Joints and Muscle Flashcards
Professor David Seiden, Ph.D. Professor of Neuroscience and Cell Biology
1
Q
How do you get a gradation of muscular function?
A
Recruiting different numbers of motor units
2
Q
Eccentric contraction
A
Lengthens the muscle
3
Q
Motor Unit
A
A motor neuron and all muscle cells innervated by it
(All or none function)
4
Q
Four components of Synovial Joints
A
- Synovial Fluid (in cavity)
- Synovium (not on articular cartilage)
- Fibrous Capsule
- Articular Cartilage
5
Q
How do the number of muscle cells per motor unit dictate coarse vs fine muscular control?
A
More muscles cells per unit for large gross motion
Less muscle cells per unit for fine motor
6
Q
The _____ joints have two bones and are held together by fibrous tissue, They tend to be immotile
A
Fibrous
7
Q
Isometric vs Concentric Contraction
A
Isometric holds muscle length the same
Concentric shortens the muscle
