11.6 – Muscle Metabolism Flashcards
in muscle, what does the source of ATP depend upon?
the duration of exercise
the total supply of ATP and creatine phosphate in a muscle is enough power contraction for about ___
1 minute
the glycogen-lactic acid system relies on which form of metabolism?
anaerobic
aerobic respiration utilizes what 2 molecules as fuel to generate ATP?
fatty acids
glucose
lactic acid and a small amount of ATP are produced during which process?
anaerobic fermentation
which process produces the most ATP?
aerobic respiration
T or F:
aerobic respiration is important for producing energy for long term energy needs
true
(by making ATP aerobically, fatigue is delayed, so long-term activity can continue)
T or F:
the duration of exercise determines which muscle mechanism supplies ATP
true
the progressive weakness and loss of contractility that results from prolonged use of the muscles is known as muscle ___
fatigue
the energy needed for short bursts of intense activity is provided by what?
creatine phosphate
ATP
w/ long-duration exercise, when does fatigue occur?
when glycogen and glucose are depleted
they glycogen-lactic acid system utilizes what molecule(s) as fuel to generate ATP?
glucose
when do muscles transition to anaerobic fermentation to generate ATP by glycolysis?
after the phosphagen system is exhausted
what function does increased oxygen consumption after exercise serve?
to allow the conversion of lactic acid to pyruvate and glucose by the liver
which provides long term energy for a cell?
aerobic respiration
slow-twitch fibers are also known as ___ fibers
red
in high-intensity short-duration exercise, what does muscle fatigue result from?
increased potassium
which fibers are adapted for a quick response?
fast glycolytic
which statements about lactic acid in muscle fibers is true?
lactic acid does not build up in muscle fibers so it does not cause muscle fatigue
the glycogen-lactic acid system relies on which form of metabolism?
anaerobic
the thighs of a chicken are composed most of ___ fibers
slow-oxidative
why does increased oxygen consumption continue after exercise?
to replace the oxygen bound to myoglobin and hemoglobin
fatigue resistance is improved by ___ exercise which enhances the delivery and use of oxygen
endurance
fibers that are well adapted to aerobic respiration are called ___-twitch fibers
slow
which types of muscle tissue are considered involuntary?
cardiac and smooth
which fibers contain a fast-acting ATPase and phosphagen enzymes?
fast-twitch
which 3 situations lead to fatigue in long-duration exercise?
central fatigue
electrolyte loss
fuel depletion
resistance exercise causes muscle growth by stimulating which of the following?
an increase in myofibril size
