Respiratory Physiology

Which is NOT a factor affecting the affinity of Hb for 02?

• temperature

• blood viscosity

• BPG

• pH

What percentage of oxygen is dissolved in plasma?

• 1.5%

• 50%

• 92%

• 20%

What structure signifies the end of the conducting zone?

• alveolar ducts

• alveoli

• terminal bronchioles

• respiratory bronchioles

What is eupnea?

• quiet breathing

• cessation of breathing

• loud breathing

• fast breathing

The DRG controls

• forced inhalation and expiration

• forced expiration

• forced inhalation

• normal breathing

Condition where arterial CO2 is higher than 45mmHg?

• hypercapnia

• hypocapnia

• hypercarbon

• hypoxia

Refers to how much effort is required to stretch the lungs and chest wall?

• contractility

• surface tension

• compliance

• resistance

The surface tension exerted by alveolar fluid is decreased by the presence of what?

• surfactant

• air

• CO2

• O2

Which of the factors will shift the oxygen dissociation curve to the right ?

• low temperature

• high pH

• high CO2

• low BPG

An increase in PO2 will increase affinity of Hemoglobin for Oxygen

• true

• false