breathin

What is the primary function of alveoli in the respiratory system?

• To transport oxygen to the bloodstream

• To warm and humidify the air

• To facilitate the exchange of gases (oxygen and carbon dioxide) between the air and the blood

• To produce respiratory mucus

Which of the following best describes the structure of the alveoli?

• Thick-walled, single-layer cells

• Thin-walled, single-layer cells

• Thick-walled, multi-layer cells

• Thin-walled, multi-layer cells

During gas exchange in the lungs, oxygen moves from the alveoli into the blood because:

• The concentration of oxygen is higher in the blood than in the alveoli

• The concentration of oxygen is lower in the blood than in the alveoli

• The concentration of carbon dioxide is higher in the alveoli

• The concentration of carbon dioxide is lower in the blood

What is the role of the diaphragm in the mechanism of breathing?

• It contracts to decrease chest volume during exhalation

• It relaxes to decrease chest volume during exhalation

• It contracts to increase chest volume during inhalation

• It relaxes to increase chest volume during inhalation

The respiratory system works closely with which other system to deliver oxygen to and remove carbon dioxide from the body's tissues?

• Digestive system

• Circulatory system

• Nervous system

• Muscular system

Boyle's law states that as _____

• Volume increases

  Pressure increases

• Volume decreases

  Pressure increases

• Volume increases

  Pressure decreases

• Volume decreases

  Pressure decreases

What is the correct sequence of air flow during inhalation?

• Trachea → Bronchi → Bronchioles → Alveoli

• Bronchioles → Bronchi → Trachea → Alveoli

• Alveoli → Bronchioles → Bronchi → Trachea

• Bronchi → Trachea → Bronchioles → Alveoli

Which of the following is a function of the nasal cavity in the respiratory system?

• Gas exchange

• Oxygen transport

• Filtering, warming, and humidifying the air

• Blood circulation

What type of cells line the alveoli and are responsible for the gas exchange process?

• Simple squamous cells

• Ciliated epithelial cells

• Simple cuboidal cells

• Stratified squamous cells

What is the role of surfactant in the alveoli?

• To increase the surface tension within the alveoli

• To decrease the surface tension within the alveoli

• To facilitate the movement of oxygen into the blood

• To produce mucus for trapping pathogens