Flashcards in Lecture 26: Skeletal Muscle Energy, Types, and Function Deck (22)
Energy sources for contraction include:
- Anaerobic Metabolism
- Aerobic Metabolism
What is a limitation of using ATP for muscle contraction?
- There are limited stores of ATP in muscle
The breakdown of Creatine + Phosphate can resynthesise the...
What're some features of anaerobic respiration?
- Short term
- Fast energy production
- No O2 required
- ATP, CP, glycolysis
What're some features of aerobic respiration?
- Long term, steady
- Slower energy production
- O2 required
- Oxidative phosphorylation
Out of Excitation, Contraction, and Relaxation, which stage requires energy?
- Need ATP to uncouple the cross-bridge
- Need ATP to re-uptake Calcium into the SR
- RIGOR MORTIS
Oxygen binds to ______ in the blood, and ______ in muscle. Both pigments colour red due to oxygen _____ binding.
- Myoglobin (only one iron group)
The soleus muscle tenses slowly and help with...
Different type of muscle fibre types:
- Slow (Myosin Type I) Red
- Intermediate (Myosin Type IIA) Intermediate
- Fast (Myosin Type IIX) White
Feature of Slow Muscles (Myosin Type I)
- Slow rate interaction w/ actin
- Slow force production
- Slow energy consumption
Depending on their function muscles are dominated by one fibre type or....
- A mix of fibre types
World class sprinters need explosive power, short duration, anaerobic metabolism, need relative less oxygen. This means that their leg muscles develop more....
- White (Fast) muscle
World class endurance athlete needs fatigue resistance, slower pace, uses aerobic metabolism
- Much higher proportion of slow/red and intermediate muscle fibre types (+ adaptations for supply of O2)
A single electrical stimulation of a muscle -> a single activation of may motor units =
- A twitch in the muscle
A twitch is a ______ event. To build up and _____ tension in a muscle takes longer than underlying _____ processes.
In a series of spaced twitches a ______ effect occurs. This is due to sustained higher levels of sarcoplasmic ____. Actin-myosin interactions become more _____ to ____. At higher temperature, _____ tension can be produced.
- "Treppe" (Staircase)
In a series of closely spaced twitches, there can be incomplete tetanus or _____ tetanus. It's called tetanus after the bacterial infection. "Summation" = ____. Main mechanism of summation is due to _____ _____ of ___ in sarcoplasm.
- More tension
- High levels
Hypertrophy is the...
- Increase in number of contractile filaments
- More power
- Strength Training
Atrophy is the....
- Loss of number of contractile filaments
In Endurance training there needs to be an increased blood supply to muscle, therefore there's a higher number of....Also increased ______ metabolism.
- Blood Vessels
- Aerobic enzymes