Unit 2 Study Guide Vocab Flashcards
Slow Twitch/Slow Oxidative (SO) Muscle Fibers: Endurance
- Small
- Red (myoglobin)
- Rich in blood supply
- Contract relatively weak
- Resistant to Fatigue
- Reaches peak contraction in 80-100 milliseconds
Fast Twitch/Fast Oxidative (FOG) Muscle Fibers: Strength
- Large
- Pale
- Less blood supply
- Contracts relatively strong
- Fatigable
- Reaches peak contraction in 40-60 milliseconds
Twitch
Brief contraction of all muscle fibers in motor unit in response to single action potential in its motor neuron
Summation
Has overlapping resting and contracting phases ⇒ increased strength of contraction before eventually going back to resting phase at end
- ex. more action potentials you send = more contractions/force you do
All-or-None Principle
If you send one signal to one unit of muscle fiber cell, it sends it to the whole cell
- only applies to cell, NOT the whole muscle
How long does Existing ATP last?
1 - 2 seconds
How long does Creatine Phosphate/Regeneration of ATP last?
3 - 15 seconds
How long does Slow Glycolysis ATP last?
2 - 3 minutes
How long does Fast Glycolysis ATP last?
2 minutes
How long does Krebs Cycle and ETC ATP last?
hours
What are Low-Intensity ATP Sources?
- Existing ATP in muscles
What are High-Intensity ATP Sources?
- Creatine Phosphate/Regeneration of ATP
- Slow Glycolysis: Pyruvic Acid to Acetyl CoA
- Fast Glycolysis: Lactate Formation
- Krebs Cycle
- ETC
What products does Slow Glycolysis produce?
2 ATP
2 Pyruvic Acid
What products does Bridging Phase produce?
- Acetyl CoA
- Carbon Dioxide (CO2)
What products does Krebs Cycle produce?
- 2 ATP
- Carbon Dioxide (CO2)
