PQ 8.4 THE RESPIRATORY SYSTEM

What are the three main functions of the respiratory system?

• Supply CO2 to the blood

• Remove O2 from the blood

• Regulate blood pH

• Supply O2 to the blood

What is the function of the conductive zone in the respiratory system?

• Exchange gases at the tissue level

• Supply O2 to the blood

• Filter air and transport it to the lungs

• Regulate blood pH

Which structures are part of the conductive zone in the respiratory system?

• Tertiary bronchioles, terminal bronchioles

• Trachea, primary and secondary bronchi

• Mouth and nose, pharynx, larynx

• Respiratory bronchioles, alveolar ducts, alveolar sacs

What is the role of the nasal cavity in the conductive zone?

• Maintain body temperature

• Trap larger foreign bodies

• Regulate blood pH

• Exchange gases at the tissue level

What is the function of the respiratory zone in the respiratory system?

• Exchange gases at the tissue level

• Regulate blood pH

• Filter air and transport it to the lungs

• Supply O2 to the blood

Which structures are part of the respiratory zone in the respiratory system?

• Tertiary bronchioles, terminal bronchioles

• Respiratory bronchioles, alveolar ducts, alveolar sacs

• Trachea, primary and secondary bronchi

• Mouth and nose, pharynx, larynx

What is the function of the alveolar sacs in the respiratory zone?

• Maintain body temperature

• Trap larger foreign bodies

• Exchange gases between inspired air and the blood

• Regulate blood pH

How many alveolar sacs does the average person have?

• 400 million

• 300 million

• 200 million

• 100 million

What is the purpose of the web of capillaries surrounding the alveolar sacs?

• Regulate blood pH

• Exchange gases between inspired air and the blood

• Maintain body temperature

• Trap larger foreign bodies

What is the structure of the wall of the alveolar sacs and the wall of each surrounding capillary?

• One cell thick

• Four cells thick

• Three cells thick

• Two cells thick