APK3120
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
