APK3120

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what is the RER?

Ratio of co2 produced to oxygen consumed predicts substrate utilization and calories expended

The ___ represents ventricular repolarization on an EKG

T wave

T/F during endurance exercise, diastolic blood pressure increases proportionally with exercise intensity while systolic blood pressure may actually decreases slightly

false

T/F resting RER is 1.0

false

active recovery leads to additional lactic acid production and should be avoided after exercise T/F

false

after prolonged aerobic exercise in a hot environment, cardiovascular drift occurs, where stroke volume gradually increases and heart rate gradually decreases T/F

false

co2 and o2 directly compete with each other for hemoglobin

false

if james and his brother (3yrs older and 50lbs heavier) both have a 4.5L/min, they are both equally fit

false

muscle cramping is usually cause by a potassium deficiency

false

the immediate increase in ventilation that occurs before the onset of exercise is stimulated by changes in blood co2 and H+

false

the majority of carbon dioxide in the blood is transported combined to hemoglobin

false

the sinoatrial node is responsible for delaying the action potential before it gets relayed to the lower half of the heart

false

veins always carry deoxygenated blood T/F

false

during submaximal exercise, the flat portion of the oxygen consumption curve is usually called...

steady state

the process of gases moving across the respiratory membrane and being exchanged in the alveoli and the pulmonary capillary blood is called pulmonary diffusion

true

the unloading portion of the oxyhemoglobin dissociation curve has a steeper slope than the loading portion

true

DOMS is associated with inflammation but not actual damage to the muscle

false

ziggy has an exercise bp of 150/60, a HR of 140bpm, a max vo2 of 33ml/kg/min, and a stroke vol of 95 ml. what is her cardiac output Q?

13.3l/min Q=HR x SV

ziggy has an exercise blood ipressure of 150/60, a heart rate of 140bpm, a vo2 max of 33 ml/kg/min, and a stroke volume of 95 ml. what is her MAP?

90mmhg MAP = sbp + s(DBP) / 3

which of the following occurs at lactate threshold? A.) a lack of oxygen in the muscle cell B.) recruitment of fast twitch fibers C.) a reduced rate of removal of lactic acid from the blood D.) all of the above

all of the above

increases in acidity and temperature...

decrease hemoglobin's effectiveness to bind oxygen

What is EPOC?

excess post exercise oxygen consumption

the arteriovenous oxygen difference (a-v)o2 dif

increases with an increase in exercise intensity

the term oxygen deficit refers to the

lag in oxygen consumption at the beginning of exercise

what is direct calorimetry?

measures heat production

the fact that an INCREASE in end diastolic volume INCREASES stroke volume is an illustration of...

the starling law of the heart

T/F a 30 min job will generally result in a greater oxygen debt than a 30 min walk

true

at rest, the majority of cardiac output is directed to the liver and kidneys

true

during an incremental exercise protocol, the region where oxygen consumption plateaus despite an increase in workload is called the maximal aerobic capacity or maximal oxygen consumption

true

lactate threshold will be attained at a higher relative intensity in a trained person when compared to an untraid person T/F

true

the frank starling mechanism explains that the heart generates a stronger contraction when there is a greater stretch on the ventricle

true

the point at which ventilation increases disproportionately compared to oxygen consumption is called the ventilatory threshold

true


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