Biology Flashcards - Respiration
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Correctly sequence the following structures of the respiratory tract:
Alveoli, trachea, larynx, nares, pharynx, bronchi, bronchioles
Nares, pharynx, larynx, trachea, bronchi, bronchioles, alveoli.
What is the function of surfactant?
Surfactant reduces surface tension on alveoli and facilitates gas exchange.
(T/F) The diaphram contracts during exhalation?
False, the diaphram relaxes during exhalation and contracts during inhalation.
Which part of the brain controls breathing?
The medula oblongata ontrols breathing.
Define vital capacity.
Vital capacity is the maximum amount of air that can be inhaled.
Define tidal volume.
Tidal volume is the normal amount of air inhaled.
Define residual volume.
Residual volume is air that always remains in the lungs.
(T/F) Total lung capacity = tidal volume + residual volume.
False, total lung capacity = vital capacity + residual volume.
What happens to respiratory rate when high concentrations of CO2 and/or H+ are in the blood?
Respiratory rate increases.
(T/F) Blood entering the pulmonary capillaries has a higher partial pressure of O2 than the air in the alveoli.
False, O2 partial pressure is lower in the pulmonary capillary blood than in the alveolar air.
How does the partial pressure of CO2 in a capillary compare with the partial pressure of CO2 in alveolar air?
The partial pressure of CO2 in the capillaries is higher than in the alveolar air.
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