If reflects that aerobic metabolism needs to be supplemented

If reflects that aerobic metabolism needs to be supplemented with anaerobic metabolism to meet increasing energy demands If reflects the point at which tactic acid production exceeds the body\'s ability to recycle lactate during exercise It will be higher in PCr trained persons It reflects the point at which the fuel being burned switched from predominantly carbohydrates to predominantly lipids If no O_2 is present, an NAD that picked up hydrogens from glycolysis will yield how many ATP from the electron transport chain? 1.5 ATP 2 ATP 2.5 ATP none Major causes of fatigue are: Inadequate energy delivery/metabolism Accumulation of metabolic by-products Failure of muscle contractile mechanism Altered neural control of muscle contraction All of the above True or False. The RER measured from gases expired from the lungs will reflect the RQ measured at the muscle level at exercise intensities above the LT. True or False. The Volume of inspired gas = the volume of expired gas. During muscle contraction, the binding of ATP to the myosin head causes which one of the following to happen: Recording of the head to a higher energy position The power stroke Breaking of the actin-myosin crossbridge Breaking of the actin-troponin bond Neural factors associated with strength gains do NOT include synchronization of motor units motor unit recruitment coactivation of agonist and antagonist muscles inhibition by golgi tendon organs Aerobic training is NOT associated with which of the following: cross-sectional area of Type I fibers capillary to fiber ratio myoglobin in type I fibers in lactate threshold RER for a given submaximal workload

Solution

24. C. 2.5

25. B. Accumulation of metabolic by products.

Accumulation of metabolic by product (lactic acid) produced during anaerobic respiration in muscle cells cause fatigue.

26. TRUE.

The respiratory exchange ratio (RER) is the ratio between the amount of carbon dioxide (CO₂) produced in metabolism and oxygen (O₂) used. The ratio is determined by comparing exhaled gases to room air. Measuring this ratio can be used for estimating the respiratory quotient (RQ). Calculation of RER is commonly done in conjunction with exercise tests.

27. True

Volume of inspired or expired air in a normal effortless breath is called as tidal volume. It accounts for about 500 mL.

28. C. Breaking the actin myosin cross bridge.

The binding of ATP to a myosin head detaches myosin from actin, thereby allowing myosin to bind to another actin molecule.