Cardiovascular
Which chambers are considered the "receiving chambers", and which are the "pumping chambers"?
Receiving- Atrium
Pumping- Ventricles
What is the volume of air after a maximal expiration?
Residual Volume
What is the definition of HRmax?
Highest heart rate achieved after all-out effort to volitional fatigue.
Roughly how much blood is pumped in 1 minute?
4-6 L
What parts of the respiratory system make up the physiological dead space?
Pharynx, larynx, and nose
Increased body temperature shifts the oxyhemoglobin saturation curve which direction? What does this mean?
Right. Your blood drops off oxygen to the tissues at a higher rate.
Blood flow= __________ / _____________
pressure/resistance
How much blood do the lungs receive at rest per minute?
4-6L
What is the increase in heart rate at the very beginning of exercise due to?
Withdrawal of vagal stimulation.
What is it called when the atria depolarize at rates of 200-400 beats/min?
Atrial Flutter
Why does hyperventilation decrease the drive to breathe?
It decreases PCO2 and increased pH
During exercise, why does the oxygen diffusion capacity increase dramatically?
The lower venous O2 content causes an increased PO2 gradient.
What variable is the primary determinant of maximal oxygen consumption? HRmax, VO2max, Stroke Volume, Cardiac Output
Why?
Stroke volume because the more blood that is pumped out of the heart with one beat, the more oxygen that can get to the tissues.
How well oxygen binds to hemoglobin is dependent on what?
PO2 and affinity between O2 and Hb
What happens to our end-diastolic volume during intense exercise? Why does this occur, and what does your body do to accommodate this change?
It drops because there is less time between contractions, which means less time for the left ventricle to fill with blood. To accommodate, torsional contraction occurs.