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Muscle contraction is required for expiration.

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During respiration,as the thorax moves up,the lungs move down.

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Carotid bodies and aortic bodies detect


A) blood pH.
B) blood oxygen levels.
C) tissue oxygen levels.
D) the stretching of the lungs.
E) the residual volume.

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Which structure is not part of the inspiration process?


A) lungs
B) larynx
C) trachea
D) bronchioles
E) All of these are part of the inspiration process.

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How does the respiratory center control the diaphragm?


A) via the blood carbon dioxide level
B) via the blood pH
C) via the intercostal nerves
D) via the phrenic nerve
E) via the vagus nerve

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Ventilation includes


A) inspiration only.
B) expiration only.
C) both inspiration and expiration.
D) the volume of air that can be exhaled.
E) the transportation of oxygen to cells in the body.

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What separates the lungs from the thoracic cavity?


A) pleurae
B) alveoli
C) cartilaginous rings
D) bone
E) skeletal muscle

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Carbon dioxide is carried in the plasma as


A) carbonic anhydrase.
B) bicarbonate ions.
C) carbonic acid.
D) a gas, carbon dioxide.
E) reduced hemoglobin.

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