Identify the incorrect statement regarding the enzyme carbonic anhydrase:

1.	RBCs contain a very high concentration of this enzyme
2.	The enzyme is absent in the plasma
3.	It facilitates the reaction catalyzed in both directions
4.	It is a metalloenzyme

Pneumotaxic center:

Pulmonary fibrosis is a pathological hallmark of:
1. Chronic obstructive lung disease
2. Bronchial asthma
3. Viral Pneumonia in children
4. Occupational lung diseases

Involuntary hyperventilation during an anxiety attack can cause the person to become faint because of:
1. increased ${\mathrm{CO}}_2$ levels caused by increase in cellular respiration, reducing brain perfusion and causing ischemia
2. decreased ${\mathrm{O}}_2$ levels in the blood, causing cells to lack enough ATP
3. effects of increased ${\mathrm{O}}_2$ levels in the blood and consequent constriction of cerebral blood vessels
4. lowered ${\mathrm{CO}}_2$ levels in the blood and consequent constriction of cerebral blood vessels

Which of the following is one of the physiological adaptations that occur in the human body at very high altitudes?
1. The kidney releases EPO to stimulate an increase in hematocrit.
2. The heart rate decreases.
3. Because of a lower ${\mathrm{PO}}_2$, the respiratory rate declines.
4. The percentage of hemoglobin saturation increases.

The peripheral chemoreceptors are:
1. more sensitive to a decrease in ${\mathrm{PCO}}_2$ than to a decrease in ${\mathrm{PO}}_2$
2. stimulated by hypocapnia
3. located in the medulla oblongata of the brain stem
4. more sensitive to a decrease in ${\mathrm{PO}}_2$ than to a decrease in ${\mathrm{PCO}}_2$

Under normal physiological conditions, what amount of oxygen is delivered to the tissues?

The binding of oxygen with hemoglobin is primarily related to:

Which of the following will not be equal in normal physiological conditions?

Regarding pulmonary capacities, the maximum volume of air a person can breathe in after a forced expiration can also be defined as: