export_exam 2 flashcards

Question 1

Creatine Phosphate Energy Pathway

Answer 1

rapidly broken down to convert atp-adp, ONLY ENOUGH ENERGY FOR A FEW MUSCLE TWITCHES 8-10 seconds

Question 2

Glycolytic Pathway

Answer 2

Rapid energy, anaerobic, INEFFICIENT only lasts 1-2 minutes

Question 3

Oxidative Phosphorylation

Answer 3

very slow, efficient, 36mol ATP/Glucose molecule; Fatigue Resistant

Question 4

Slow Oxidative Fibers

Answer 4

Type I- Low myosin ATPase activity, high oxidative capacity, i.e. Postural muscles

Question 5

Fast Oxidative Fibers

Answer 5

Type IIa - High Myosin ATPase activity, high oxidative capacity, intermediate glycolytic capacity

Question 6

Fast Glycolytic Fibers

Answer 6

Type IIb - high Myosin ATPase activity, high glycolytic capacity - fatigue relatively quickly; HAVE NO MYOGLOBIN (brings O2 to muscle)

Question 7

Specific Force

Answer 7

force/cross-sectional area - Same for all types of fibers after “normalized” (divide by cross-sectional area)

Question 8

Force of muscle

Answer 8

dependent on # of crossbridges. Additional: Sarcomeres in parallel increase force

Question 9

Muscle Velocity/Speed

Answer 9

depends on rate of ATP hydrolysis/break off. Additional: Sarcomeres in series increase muscle speed/velocity

Question 10

Fatigue Causes

Answer 10

• not enough time to clear Ca2+ with high frequency of AP firing
• Acumulation of K+ leading to inability to depolarize

Question 11

Fatigue Definition + Effects

Answer 11

• failure of excitation-contraction coupling

- shuts down ability of DHP to interact with RYR