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A decrease in the pH of human blood during exercise is caused by . decreased CO2 which then leads to increased breathing rate increased CO2 which then causes an increase in heart rate decrease of the amount of O2 unloaded from hemoglobin

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A decrease in the ph of human blood during exercise is caused by l.jpg

A decrease in the pH of human blood during exercise is caused by

  • decreased CO2 which then leads to increased breathing rate

  • increased CO2 which then causes an increase in heart rate

  • decrease of the amount of O2 unloaded from hemoglobin

  • the fact you never work out and just pass out when forced to exercise

  • decrease CO2 binding to hemoglobin


Slide2 l.jpg

Which of the following reactions prevails in red blood cells traveling through pulmonary capillaries? [Hb= hemaglobin]

  • Hb + 4O2 -> Hb(O2)4

  • Hb(O2)4 -> Hb + 4 O2

  • CO2 + H2O -> H2CO3

  • H2CO3 -> H+ + HCO3-

  • Hb + 4 CO2 -> Hb(CO2)4


Blood returning to the mammalian heart in a pulmonary vein drains first into the l.jpg

Blood returning to the mammalian heart in a pulmonary vein drains first into the

vena cava.

left atrium.

right atrium.

left ventricle.

right ventricle.


Slide4 l.jpg

Compared with the interstitial fluid that bathes active muscle cells, blood reaching these cells from arteries has a

  • higher PO2.

  • higher PCO2.

  • greater bicarbonate concentration.

  • lower pH.

  • lower osmotic pressure.


Slide5 l.jpg

Which of the following correctly indicates the path that deoxygenated blood takes to become oxygenated?

  • Right Atrium, AV Valve, Right Ventricle, Pulmonary Veins, Lung

  • Left Atrium, Left Ventricle, Semi-Lunar Valve, Aorta, Lungs

  • Right Ventricle, Left Atrium, Right Atrium, Left Ventricle, Pulmonary Arteries, Lungs

  • Right Atrium, AV Valve, Right Ventricle, Aortic Semi-Lunar Valve, Aorta, Lungs

  • Right Atrium, Right Ventricle, Pulmonary Semi-Lunar Valve, Pulmonary Arteries, Lung capillary beds.


In negative pressure breathing inhalation results from l.jpg

In negative pressure breathing, inhalation results from

  • forcing air from the throat down into the lungs.

  • contracting the diaphragm.

  • relaxing the muscles of the rib cage.

  • using muscles of the lungs to expand the alveoli.

  • contracting the abdominal muscles.


Slide7 l.jpg

When you hold your breath, which of the following blood gas changes first leads to the urge to breathe?

  • rising O2

  • falling O2

  • rising CO2

  • falling CO2

  • rising CO2 and falling O2


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