respiratory system 2

Which of the following is TRUE about the respiratory response to constant-load submaximal exercise?

• The PO2 and PCO2 are relatively unchanged.

• Ventilation increases slowly.

• Ventilation tends to drift upward.

• The PO2 and PCO2 increase rapidly.

The ventilatory threshold (Tvent) is the

point where ventilation increases exponentially.

• True.

• False.

The peripheral chemoreceptors that influence the control of breathing respond to changes in what?

• PCO2 in cerebrospinal fluid.

• H+ in cerebrospinal fluid.

• K+ in cerebrospinal fluid.

• PCO2 in blood.

Where is the location of central chemoreceptor?

• Carotid body.

• Aortic body.

• Medulla.

• Cerebrospinal.

Respiratory muscle fatigue does occur during high-intensity exercise (>90% VO2 max).

• True

• False