Energy for muscle contraction

The energy used to power the interaction between actin and myosin comes from what?

ATP

How long does ATP stored in skeletal muscles last?

About 6 seconds

ATP must be—continuously if contraction is to continue

Regenerated

How many pathways are there in which ATP can regenerate?

Three

Three pathways in which ATP is regenerated

Direct phosphorylation

Aerobic respiration

anaerobic respiration

What is 4x-6x more abundant in muscle fibers than ATP?

Creatine phosphate

Creatine phosphate is a—molecule

high-energy

After ATP is depleted what is left?

ADP

Why does creatine phosphate transfer energy to ADP?

To regenerate ATP

How long does it take for creatine phosphate supplies to be exhausted?

10-20 seconds

Series of metabolic pathways that occur in the mitochondria

Aerobic respiration

Glucose is broken down into—releasing energy

CO2 and H2O

Aerobic respiration is a slower reaction that requires what?

O2

How long can Aerobic respiration supply the muscles with ATP for?

Hours

occurs during strenuous muscle use when respiratory and cardiovascular systems can’t supply sufficient O2

Anaerobic respiration

Anaerobic respiration breaks down—without O2

Glucose

In anaerobic respiration glucose is broken down to —- to produce ATP

pyruvic acid

Pyruvic acid is converted to—-creating an O2 debt

Lactic acid

Muscle fatigue is a state of physiological inability to—

contract

What causes muscle fatigue and soreness?

Lactic acid produced bc of O2 debt

relative deficiency of ATP

The amount of oxygen required to convert lactic acid to glucose

oxygen debt

needed to replenish spent—-by converting lactic acid into glucose

glycogen stores in the liver

How long does Oxygen debt last?

Hours