Skeletal Muscle Mechanics Flashcards
1
Q
What is preload?
A
Load on the muscle in a relaxed state
2
Q
What does passive tension measure ?
A
The force necessary to resist stretching of the muscle
3
Q
What is afterload?
A
Load the muscle works against
4
Q
What is a isotonic contraction?
A
When the muscle shortens against the afterload
5
Q
What is an isometric contraction?
A
When the afterload is too big, thus the muscle is not shortened
6
Q
How is active tension produced?
A
Cross-bridge cycling
7
Q
What interaction does active tension depend on ?
A
Number of Myosin-Actin Cross-Bridging
8
Q
Characteristics of White Muscle
A
- Bigger (large mass per motor unit)
- Shorter term action
- High ATPase activity
- Anaerobic glycolysis
- Low myoglobin
9
Q
Characteristics of red muscle ?
A
- Smaller (small mass per motor unit).
- Low ATPase activity.
- Large amounts of mitochondrias (high aerobic activity).
- High myoglobin
