Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
PHYS2
Muscle II
| Question | Answer |
|---|---|
| Tension: | Force exerted on an object by a CONTRACTING muscle |
| Contraction: | Activating cross bridge cycle |
| TYPES OF CONTRACTIONS | TYPES OF CONTRACTIONS |
| What are the three types of contractions? | Isometric, isotonic and lengthening (eccentric) |
| Isometric: | Muscle developes tension, but doesn't shorten |
| When would this happen? | Pushing against resistance |
| Isotonic: | Load on muscle remains constant but the muscle is shorteniing |
| When would this happen? | Lifing weight, weight is constant--> you shorten muscle |
| Lenghening: | External load on a muscle is greater than muscle tension, causing muscle to lengthen |
| Example? | If you get passed a haeave object, and you just don't have enough strenght to lift it |
| Twitch contractions: | Mechanical response of a muscle fiber to a single AP |
| Contraction time: | Time interval from start of tension to peak tension. |
| What is the latent period? | Delay before onset of shortening |
| What does the magnitute of the load being lifted impact? | Distance shortened and latent period |
| So what's the time and distance shortened of a muscle lifting a really light object? | Short latent period and shortened a lot |
| What is summation? | Increasing AP leads to increase in tension and shortening |
| What causes summatioN? | Calcium not having time to get back in SR--> increases tension |
| What is tetnus? | Max tension |
| What is optimal length? | Max overlap of thick and thin filaments |
| What happens when you go beyond LO? | You decrease tension |
| What is the relationship between velocity of shortening and load size? | indirect relationship! As load size increases, velocity of shortening decreases |
| When would maximum velocity occur? | at zero load |
| What determines shortening velocitY/ | rate at which individual cross-bridges undergo cycling |
| MUSCLE METABOLISM | MUSCLE METABOLISM |
| What happens to the rate of ATP breakdown as the muslce is contracting? | Rate continues to increase |
| How can muscle fibers form ATP during contractle activity? | 1. Transfer phosophate from creatine phsophate to ADP 2. Oxidative phosphorylation of ADP in mitochondria 3. Substrate level lphosphorylation of ADP in glycolytic pathway |
| EXCERCISE | EXCERCISE |
| What is the fuel consumed at begining of excercie? | Glycogen |
| In the middle? | Glucose and fatty acids from blood |
| When the intesity of excercise becomes great? | Glycolysis contributes a larger % of ATP generated |
| What's the point of using the glycolysis? | So you don't use blood glucose |
| What is muscle fatigue? | Stimulating the same muscle fiber over and over again which leads to a decrease in tension |
| What causes muscle fatigue? | Internal changes in acidity; phosphate concentration; glycogen depletion; excition contraction coupling failure NOT by a lack of ATP |
| What happens as a result of muscle fatigue? | ATPase pump area decrease in Acidity stop sus from getting Ca from SR, |
| What does it mean if we can't get Calcium: | Stops contracting |
| TYPES OF SKELATAL MUSCLE FIBERS | SKELETAL MUSCLE FIBERS |
| How can we differentiate b/w muscle fibers? | How fast they shorten, how they get ATP |
| COMPARE FAST AND SLOW FIBERS | FAST AND SLOW FIBERS |
| How fast can fast fibers break down AtP? | Really fast |
| How about slow fiber? | more sllowly |
| OXIDATIVE AND GLYCOLYTIC FIBERS | OXIDATIVE AND GLYCOLYLTIC |
| What do oxidative fibers have that the glycolytic don't? Thus, what can they do that the other one ccan't? | They have mitochondria and can carry out oxidative phosphorylation |
| Glycolytic fibers: | Few mitochondria, but lots of glycogen |
| Which one has more myoglobin? | The oxidative fibers |
| Which one can develop a greater maximal tension? Why? | The glycolytic, because they're bigger |
| What are the three types of muscle fibers that can exist? | Fast and slow oxidativem, and fast glycolytic |
| Slow oxidative characteristics: | Low myosin-ATPase activity and high oxidative capicity |
| Fast oxidative characteristics: | High myosin-atpase activity and HIGH oxidative capacity |
| Fast glycolytic: | High myosin-atpase ativity with HIGH glycolytic capacity |
| FATIGUE RESISTANCE | FATIGUE RESISTANCE |
| slow oxidative: | Very resistant to fatigue |
| Fast oxidative: | Middle |
| Fast glycolytic: | Quickly fatigued |
| What composes muscles? | Fibers organized into motor units |
| How many fibers exist in a motor unit? | All fibers in a motor unit are of the same fiber type |
Created by:
talkglitter2486